Is there more than sex?

So I known and been seeing this guy since 2011 through all these years we been through up and downs. We never dated but been more like friends with benefits. We had arguments in the past but every time I tell him I'm done I want nothing with him he keeps coming back or gets sad. He now has a girlfriend. I told his gf that he was seeing me but she didn't believe me. People have said that we will end up together. I don't think so. I got no feelings for him no more. But when were together I can feel his heart beat fast. He asked me if we could cuddle last time. I don't get him when talk and see each other but then sometimes he stops contacting me. He has apologize many times for what he has done to me (hurted me) I just don't get why he won't let me go. Can sex really bring people closer?