I'm in a similar situation. I honestly don't have a lot of advice, since I'd be a hypocrite if I told you what to do. Obviously I agree with Lynn, cutting off contact is what you need to do. But it's really hard. I mean, they make you hate yourself, they make you feel horrible, but all you want is for them to need you again.

Try to do what I can't; cut off contact. Bury yourself in something else, like writing, painting, exercising, dancing, whatever keeps your mind off him.