Depends on how long you've been together. Six years is a pretty strong investment. OTOH, if you had just met him last week, then CYA. Certainly no one suddenly loses "communication skills" or ability to listen. Somthing has caused a road block that has brought out this characteristic in him that's always been there, but was not relevant to yr relationship. If you hope to save yr relationship, you need to figure out what that is, and more importantly, need to make him understand it.

First off, really sorry that you're going through this. The end of a relationship
is always difficult.
And yes, I said "the end of a relationship".

Based on what you said (and I believe you, I think you're pretty level-headed, and not a drama queen, who makes up shit just to have something going on), he no longer communicates, you've tried talking to him, it's been going on for months,
it's over.
I don't believe in ultimatums. To me, giving someone an ultimatum is equivalent to emotional blackmail, and it hardly ever works. In most cases, even if the other person acquiesces, it's only temporary, and you're right back to where you were in fairly short order.
He's made his position clear. If he were interested in making the relationship work, he wouldn't be behaving as he is.

Make your own plans. Do not include him in those plans. Begin the execution of
your plans as quickly as possible.
If he's in your house, boot his ass out, with no remorse. No discussion, and no possibility of making you change your mind. Have people present for your own protection.
If you're in his house, make arrangements to move you and yours into another domicile as soon as financially feasible.
If you are both on a lease, find out what your legal obligations are. Take the necessary steps to extricate yourself.

Do not tell him your plans. He has no right to know what you're planning.
If you think there is any danger of violence, be prepared to file for a restraining order, and go FASTER.

I know there are some who will think that I am unnecessarily going straight to
Def-con 5, but I've been through this. I've seen this play out in multiple scenarios for myself, and others.
The ONLY thing that matters is protecting yourself, and any children who may be
effected. His feelings are irrelevant now. He has shown you that he no longer cares about the relationship, therefore, he no longer cares about about your feelings. I'm not saying to be ugly, vindictive, or confrontational in any way.
Actually, that is to be avoided as much as possible.

Don't make excuses for him. He's a grown-ass adult. If he doesn't know how to conduct himself within the context of a relationship, it's not your job to hang out and teach him. He may never learn, and you've got more important things to do.
Good luck going forward. I'm here for you if you need moral support.

i would address him and say either we sit down and talk now or I will be leaving soon.If he isn't ready to talk the time to leave is now.

The 7 year itch is a real thing. It's the point in the relationship when your partner feels trapped, that he is missing out on things he'd be able to pursue if not for you, and his resentment grows each day. Sometimes it blows over, and your relationship recovers to be stronger than ever. When is it beyond salvaging? When you find yourself unable to swallow any more of his crap. Everyone has a different point of no return. Taking the step to separate yourself from the drama isn't easy, especially if there are children involved, but the old saying here applies, if you think you have a problem, you probably do. That's all I got. See a counselor by yourself, if he won't join you. My ex decided to move out just about 10 years ago, after 28 years of marriage. I let her go without a fight, best move I've ever made. Good luck, DNB.

I'm sorry you are going through this. =[

A number of people have mentioned pregnancy in this comment thread but I see nothing in your post to suggest that. If he has had such a major attitude shift in a relatively short period of time my guess is that something is wrong (yeah, I know, stating the obvious). If you have tried to pin him down on what's bothering him or what "issues" he may have in the relationship in the spirit of trying to fix things and he is not responding to you, it could be he has already checked out.

If that's the case you may not be able to change it, and probably shouldn't want to. Why fight for someone who doesn't want to be with you? If he really is done, it would be nice for you to at least know what his deal is.

Damn. I'm sorry you're in that place. I don't know that I could put a time frame on it. You will just need to satisfy yourself that you have exhausted all of your options. You'll either get to a point where you find a root cause and the two of you can work on it or, you'll determine for yourself that you've done all you can and it's time to move on.

I hope you can bring it back to "wonderful". If it's been there before, you can be there again. But, only if you both want it.

What you're describing sounds like a loss of interest in putting effort into the relationship. That could reflect anything from an actual loss of interest in you, to depression, physical issues, mid life crisis, etc.

There's nothing in your post about being pregnant but a couple of people have mentioned that. If that's the case, it's particularly concerning that this is developing at a time when a couple should be drawn together in anticipating making a stable home for the child. Maybe he's freaked out for some reason about being a father and this is his way of avoiding "dealing" with it. But until he opens up about it you can only guess. If pregnancy is in the mix then my money would be on some kind of approach avoidance going on around that ... but ethically, he has to work it out. If you have to issue ultimatums to make that happen, then so be it.

Sorry you are going through this.

He is not interested in his relationship with you . Sounds like , he's found someone who he thinks makes him feel better about himself . He has no intention of making you feel good about your relationship with him . Prepare to stand on your own two feet .

If you are miserable, and have made many attempts to discuss it, maybe he has no desire to work on your relationship. That may be the time to reevaluate what you want out of your relationship. You could try couples counciling, if he is willing to go, but, eventually, if nothing improves, you will have to decide if this is how you want to live. No one can tell you what to do. Only you can make that decision.

Not much longer. If 3 month and open discussion hasn't helped, it might be time to ask him if he's trying to drive you away.

I can't offer any great advice. I hope things start to work out better for you!

An abrupt personality change can mean anything from cheating to mental or physical illness. I would have what my grandma would have called a "come to Jesus meeting," meaning a pull-out-all-the-stops confrontation. I wish I had done that before actually catching my husband in the act. By then it was too late.

I hung in there too long for the first two long terms...well it seems like it was too long, but I think that we are in it until the time is right for it to end. The 3rd (and last one so far!), I didn't wait so long, once the red flags were popping up all over the place! I have learned to not tolerate being disrespected in any way. After trying to communicate openly about the issues, if they are not willing to own their actions, not willing to work on the issues, it's time to kick em to the curb. Stand your ground, you deserve to be treated with kindness and love and RESPECT.

Sit him down and have one more talk to him. Make it as obvious as what you are saying to us here. If he doesn't respond, you know how long you have to take.

In fact, you already know, or you'd not be asking. My real advice here is to make sure your partner KNOWS before you move forward.

What significant changes have occurred in your life, his life and your shared life in the past few months? This could give you a clue as to what has happened that has caused this change in your relationship, rarely does change occur in a vacuum so look at yourself as well as him, then maybe you can sort things out with him. It sounds like it needs to be addressed and the sooner the better.

A few months doesn't seem long compared to almost 6 years of good. I would find a nice quiet relaxed time to try to get to the bottom of it. And, perhaps acknowledge that he might not be ready to talk, but ask that he does soon.

Most people are bad liars and don't suffer in silence. Has he said what is bothering him? Often times, the person has and the other person isn't hearing it. It can be that we don't understand, think that it couldn't be true, or whatever. I've been on both sides of that situation in the past. If he suddenly isn't communicating after 6 years, I'd venture a guess that he doesn't feel like he has been heard and is unplugging. That isn't good behavior on his part if I'm right - it's destructive and cruel. Still, people get frustrated and then get righteous. It's a crappy yet common pattern.

Keep trying to communicate. If he is unplugged, then he might be just working up the courage to walk. There are other details I'd want to ask to give you advice, but I don't want to pry. I'll say this much with confidence: If communication breaks down and one person is not trying to rebuild it, then there is no relationship.

Best of luck.

I tried for years with kind of the same situation. All my attempts to discuss issues and/or to find out what they thought the problem was were met with a stone wall, "I don't want to talk about it."

Given that history, I'm not willing to let things go nearly that long again with no improvement, even though it's with someone else. Being devoted to the person you're married to doesn't fix anything by itself. So, take that into account when considering my advice.

I view ultimatums as a very likely short path to the end of a relationship, so I don't take their use lightly. If you're reached the point where you're asking mostly-strangers on the Internet for advice about whether or not to quit the relationship, then it's probably time to break out an ultimatum.

Sit down with him and explain that his behavior in the relationship has changed in a way that you really don't like, you've tried talking to him about it and you don't feel it has improved anything. So you want to make it clear to him that if he isn't willing to take this concern of yours seriously, and make a good-faith effort to work on it, you don't think you can keep going with it.

That tells him there's clearly a problem, that you feel it's very serious, and you require his help to work on it. He will know that refusing to address it will likely end the relationship, and with no ambiguity there to let him later claim you sucker-punched him. If there haven't been any changes/improvements within two weeks of that discussion, his actions have told you what he might not be willing or able to put into words - possibly that he doesn't want the relationship anymore and doesn't know how to go about ending it.

I didn't know about the pregnancy, with that information I would change my answer. Don't give up just yet, consider other ways to communicate. Ask him if he would write down what's bothering him if he won't talk about it. Request he attend couple's counseling with you. Maybe give him a few more months to adjust to the changes before giving up on him.

I would ask him directly if he wishes to recover the previous quality of the relationship. If he answers yes, ask for a joint commitment to go into counseling to get help. If the answer to either question is "no", then it is time to start taking action to dissolve the relationship.

That’s not an easy question to answer. Have you tried to tell him how fed up you are and that he’s getting close to losing you? Maybe he’s freaked out about the baby and doesn’t know how to communicate that to you or maybe even to himself. Maybe he’ll snap out of it once the baby arrives.

That sounds like a drastic personality shift. Make him see a doctor, maybe?

Perhaps he's ill? Seriously....how long since he's seen a doctor? You don't mention his age but he could have hormone issues or something worse. Just a thought. GOOD LUCK TO YOU!

Could he be unwell? If it’s a sudden change and not his usual self?

I’d suggest couples therapy, even if just for yourself so you can get good, specific info.