First time poster-needs advice

[mm2bs]

Sandi posted this on another thread that I just read and I am struggling with this question myself...

Tell me, b/c I would really like to know, why a man wants to remain with a woman who tells him she no longer loves and can't see herself ever being intimate with him again? Do you not believe her? Do you think you know her real feelings better than she knows herself? Do you think you can persuade her to stay in the M and that she'll change her mind?

In my situation my H has asked me a number of times why I want to be with someone who doesn't want to be with me. I never feel like I have a good answer. I believe in marriage. I believe in for better or for worse. I guess in some regards I don't believe him or his feelings?
I am still struggling with the believe none of what he says advice. When we do talk (which is rare) he will say things like "I know you don't love me" "why do you want to be with me" , It's better for the kids if we are apart because we can't get along. He'll also mention things I've said or done in the past as reasons for why he thinks he no longer feels in love with me. I guess my question is what do I believe and how do I figure out the things I need to work on for me?