What do I do!!

I'm 16 and have been sleeping with a boy who is the same age as me. He was my first but we have never dated and it feels like we are just having sex whenever we can because he wants to. I can amit I do enjoy it but he doesn't want a relationship or anything like that. I like him a lot and I told him and he said he doesn't feel the same way back. I get every angry with him and we argue because it feels like he doesn't care but he says he does. What do it do ??