Pregnancy is making me crazy...

All of these extra hormones has made me regain feelings for my child's father. When I initially told him I was pregnant we broke up and hated eachother for about 3 months. We slowly started back talking maybe twice a month for two months and now we talk daily (7months pregnant). He has been going to every appointment and being very supportive but I recently found it that he has started back talking to someone he used to date that I constantly got into it with over him. They were together for 6-7 years and he mentioned to me about two weeks ago about her being upset that he got me pregnant and she wanted to be his first. Well apparently they've been seeing eachother again also and it pisses me off. I want him to live his life but I've never liked her and I don't want her around my child at all. I'm starting to not even want him in my child's life anymore because I don't want to deal with the foolishness. When he's in a relationship or talking to someone be complete ignores me and acts as if I don't exist. I just don't get it it 🙄🙄. Am I just being over dramatic or what??