Wonders what the hell to do

I'm putting it all out there. Me and the wife had a lengthy discussion the other night, she said that she used me, though she loves me, I am at best friend status, and not remotely romantic status, that we got married for the absolute wrong reason (something we both agree on) that she has carried a bit of resentment in her for the birth of my daughter, that she has been asked out quite recently by other men and she has said no because she doesn't want to hurt the children.
She tried to say she doesn't want the marriage to end, because she doesn't want to lose me. At the same time, every day I have she is gone and I am at home alone with the kids while she goes out and pursues trying to get herself back...

This talk has kept me from sleeping properly the last couple of nights, and of coarse I was off of work and Ann was out both nights. So this morning I said I think it is time for me to leave. She responded with don't make a rash decision and do something you can't take back. However, other than being a baby sitter for my kids, why am I there. We barely have interaction, when we do talk it's generally me saying why are you doing this, or something like that. Her other reaction was she doesn't want me to go and she wants me to stay and for more than just needing me...what the hell...

I have been through enough..
I am and always have been a good guy
I am a good dad to those kids
I have been a faithful loving husband
I have stuck it out longer than any other man would've
But I feel enough is enough..
I can try to pretend that me leaving she will then realize what she has done...but there are no garantees on that, although I do know no other man would tolerate half of what I have been put through. I am angry. I deserve better and always have...