You can be his friend but like me, when I break up with a boy I don't see anything good about him anymore. Well, my type of guy of course... :P

But it matters in what he feels and what you feel. If you feel like you still want to be with him (but not as serious), then tell him. He might understand if he agreed on sleeping with you. But if he says again that he doesn't want anything anymore, then let him go.