Girl, I know how you feel. It is hard to break it off sometimes, but you can't let yourself get hurt like that. While he is having his fun by using and hurting you, that is all you are getting. This may seem kinda bad, but if this is what it takes, find someone else first, someone who will treat you good, then leave. You don't even have to cheat or anything. I finally had to do that to get away from my ex-husband. I hated the fact that it finally took that, but I got tired of the whole "I am leaving for good this time" thing, then just getting back with him a week or two later just to be treated like shit again.