I could choke him right now

33 weeks pregnant.... get an IG message out of the blue from a girl saying she’s been seeing my boyfriend and child’s father for over a year. Per her, he told her we aren’t in a relationship, he’s with trying to be a man and do the right thing, that he loves her, and they could still try to be together.... I’m so hurt/embarrassed/MAD. I really want to tell him to get tf out but my son would be really upset. Ugh I just want to run away. Really trying to calm down but I can’t stop crying and I think I’ve been having Braxton Hicks contractions all day 😩