I don’t want my daughter around his girlfriend!

Okay let’s start off by I’m not upset nor am I mad that he went back with his ex bc they have a child together. BUT when I got pregnant he decided to believe her I cheated bc I liked a picture of someone we both knew. Whatever he wanted a reason to leave BYE. Through my pregnancy I did it completely alone and was mature about everything. She’s send me pictures of them together. Send me text that he left me for being a whore. I never gave in to anything I just ignored I wasn’t letting her sabotage my pregnancy. I lover everything about my pregnancy and had a beautiful baby girl. He decided to go back with her again. My baby is 5 months and is beautiful. At first he was coming over a few days a week and never missed anything she needed. Now he lives with her and never comes makes you excuses to y he can’t see her and when he does it’s 20 min once a week if not weeks go by. I DO NOT WANT THAT WOMAN AROUND MY DAUGHTER. He asked to take her and I refused. Advice ? I’m not being petty but she can’t stand my child nor me. To me she’s not a woman: a woman wouldn’t EVER stop a man from seeing his children. As I never did to her child when he would go.