There is a conundrum in stating love can or can not be “unconditional”. In my view all aspects of life are conditional including love, it may be a denial of conditions we perceive as bad or negative. In the natural world and interactions between people, almost our everyday life is driven by conditional experiences, interpreted by our emotions and previous experiences.

Yes. I loved my ex-wife unconditionally. She killed that love, but that love never failed. I waited a decade for her to say something and when she finally did, I felt nothing. Love had died. I did not hate her, but I had to leave her and the rotting piece of my heart that refused to give up behind or it would have killed more. If she had never said it... it'd be five years later and I'd still be with her, a rotting zombie...

Being that "love" is an emotion caused by the firing of chemicals and neurons in the brain, I would say yes. There are many different types of "love" (love for one's child,romantic,etc.) So the question is vague but ultimately because emotions are chemical responses, I would argue yes. These feelings can be unconditional but they can also be controllable.

I don't know.