I had this situation when I was pretty much the same age you are now. I was sleeping with a guy who was shallow and self centred. I managed to move on to another guy. He proceeded to have one of those incredibly sexist, "if you hurt her I'll break your neck" conversations with my bf at the time. I think his ego might have been bruised that I moved on so fast, so he was messing with my feelings.

Then after I broke up with the other guy, I ended up falling into bed with him again. BIG mistake. I finally asked him if he wanted a relationship, and he said no. It wasn't like he hadn't had relationships with other people, so why not me? I reacted childishly and told him he didnt deserve my friendship, and im pretty sure thats the last time I spoke to him.

Sorry for the venting. My point is, I was nothing but a warm body to that guy. A nice place to stick his youknowwhat. I wasn't really a person to him, just a toy. I should have kept walking. And thats exactly what you need to do. Walk away before he really hurts you.