So mad at my SO's mother

Brittany • Mommy to a wonderful 12yr old boy, 9yr old boy 7yr old girl 6yr old girl and 3yr old girl. Due March 11th 2023 with a boy.
I've told my Bf that I was unhappy in our relationship for many reasons caused by him and since I'm not happy of course I don't give him the attention he wants. I'm not out there cheating or talking to other guys. I'm 8mths pregnant and want to work things out but I need him to change. Well he must talk shit about me to his friends and Family cuz his mom publicly on FB told him to leave me then within 2mins deleted the post. Damage done I already seen the post. I told my BF that his mom doesn't need to talk to me or do anything for my daughter. My parents know all the crap I've gone through with him and how irresponsible he is and never once have told me to break up with him not even my Best friend has said to break up with him. But his friends all female of course and his mother tell him to leave me cuz he walks around all depressed and posts bullshit on fb that makes me look like a bad person. I can't help that his actions make me unhappy.