Leave. Find a way. You won't be able to sort this out without support (a t, a group, a friend---maybe on of those who is frustrated with you would be helpful if you made the decision to move on) and he is Not going to change. And you are not going to feel any better about him or yourself. People like this do exist. And, before you get involved again, it is important to figure out what attracted you to someone like this to begin with so that you avoid repeating...