Assuming it was to spare her from your demons, you shouldn't deny her the choice of committing to you if you can't trust your judgment otherwise. I understand wanting to protect her from who you may be afraid of becoming and it takes a great deal of resolve to separate yourself from someone like that but still. Maybe you're falling apart but that's why we agree to stay with people.
Maybe her life can go on without you..but all I know is I'd have given every other possibile life to help someone I loved before in this one now..and it was maddening, the way I was pushed away in the end.

You did the right thing. If you're the problem due to your PTSD, it's best to remove yourself and get help rather than to continue hurting those you love and who love you. But, you need to communicate with them your intentions. They deserve the truth.

I was recently on the recieving end of this. She left me because of her demons and didn't give me a say in it. I'm broken and a mess, I don't know how long it will be before I can trust someone again. You should go to her and let her know you love her and was just trying to protect her, and go get help for your PTSD.

Sorry you are struggling right now. I was suicidal two years ago. Thanks to medication and a good therapist, I am doing really well right now. Please seek help. Things can get better, but it might take a bit of work. It is also possible that there is a reason you don't want to acknowledge for ending the relationship. Of course I have no way of knowing, but sometimes our subconscious leads us in a direction we don't want to go for good reason. Worth exploring with a therapist. Good luck.

Sorry you are going through some bad times.

I don't understand the term (or meaning of) "Doubting God" as this appears to imply god, not you or any other circumstances, are in charge of who you are, what you do, and what will happen to you.

Hope you find happiness. PTSD is not fun. If you have a military background, may be worth looking for resources to help mitigate that condition.

Your are going through a tough transition. But, I actually found that life sucked less once I stopped having to struggle with questions about God every day.

Are you suffering from anxiety?

There is no god, but there are doctors!

Dont bother doubting god, there is no such thing.