Capricorn man , I want him back ?!?

Hi I'm an aquarius woman and I had a capricorn man I was talking to. We started off just speaking , but we were finally going to have sex , but didn't because it just didn't feel right at the time , but we were basically on the midst of it . He seemed cool about it , but eventually stopped talking to me for 2 months , but eventually came back . We tried 2 more times , but decided to call it quits . He had a girlfriend(he refers to her as something like that when people ask if she's his girlfriend via facebook) the last two times we talked , but I literally just found out about her . Idk y he's so important or why I even want him back . Maybe I just want the sex , but how do I go about telling him it or even getting him back ? I love astrology so it's welcomed .