Friends with Benefits

My ex and I broke up over a year ago. I still love him. And it was a bad break up, probably the greatest I'll ever experience. He was never the type to call or text me first even when we were together, it's not in his nature. But I still call and text, he answers and replies. Lately we've been having sex. I don't think he still likes me and I kind of feel like a bug a boo. Like I know he entertains it but does that mean he's doing it because he just wants some or is it possible that he just might like me? I tell myself everyday that I should move on. How do I move on? I'm tired of feeling clingy and crazy.....any suggestions?