Sex with an Ex

My ex broke up with me on the 15th, claiming he still loves me. Blah blah whatever. But since then it has been a lot of drama, but That’s besides the point too. Every time we meet up we have sex, mind blowing sex. Better then when we were in a relationship. Passionate slow loving. Everything you would want. But I’m very much in love with him and he claims to be in love, but doesn’t want to be with me. To better himself and he feels like we argue too much. But its weird because we both love each other, was in a relationship for a year. We can’t leave each other alone. So much history. But I don’t know what to do.