Venting..my son is 3 months and I’ve been resentful and hateful this week to his dad bc he got…

Venting..my son is 3 months and I’ve been resentful and hateful this week to his dad bc he got another girl pregnant while I was 7 mo pregnant and I just found out they’re having a girl I’m jealous and feeling crappy bc he’s gonna be there for them when he hasn’t really been for us. Stopped replying to his texts and I’m the bad guy for “taking his son away from him” but he lives 10 mins away, i just don’t want to deal with him but I know I can’t “take him away” from his dad bc I hate him 🙄😒