I know his doesn't have anything to with pregnancy or babies but I need advice!

My ex does not seem to understand that things and feelings have changed. We have been on and off for 6 years. For the last 2 years we have not been together at all. I have had a baby. While I was pregnant I tried to get back with him and work things out but he pushed me away, while telling his mom he wanted to get married. He wanted me to sit around and be at school pregnant while he do him. (The baby is not his, but he has had several girlfriends). Anyways I told him we could work on things. He want to get back together and move in and get engaged all in the same day. I told him I'm not ready to move in just yet but we can work things out. He says that is childish and we too grown for that. I tried explaining to him that I have reached my breaking point and that being with someone you have been with for years would be nice it's different. That while he was moving on and fucking different females I was wanting to be with him. Now he wants to be with and things are vice versa. Y'all this is confusing. I need help explaining