I hate to say this but i think that you are right when you say he is using you. Dont give hime that power. All you're doing is showing him that he has the control over you. The more control he thinks he has, the more he is going to do it and the more you are going to get hurt. I dont know you but if i were in that situation i would try my hardest to get back out because you are better than that. All girls DESERVE better than that. My advice leave him there on his ass. Show him that you dont want him, even if you still do. The more you distance yourself the better you will feel in the long run. Than he is gonna want you more and more and thats when its time for payback. I hoped i helped. Good luck to you.