jsniceguy-
I don't know all sides of the story, but don't give up on this. It is easier and takes less courage to slink away and be accommodating. She wants out, to bad. She made a commitment to you and you to her.
I want to post the following video because it is an excellent representation of a dialog between the alpha and beta aspects of the same male personality. There is swearing in it, so if you are offended please don't watch. But the lesson is hard medicine and part of that is dealing with 'offenses'. I read the forum guidelines and didn't see anything against posting this sort of thing.
Again, a brief conversation between alpha and beta. I actually find it to be quite inspiring and its the kind of conversation you need to have within yourself:
YouTube - Deadwood: Al's Take On Misfortune