Fed up

I just need to vent.

My boyfriend and I have been going through a rough patch and his baby mama isn't helping. He met her, went on one date, and she moved in the next day. 2 weeks later she got pregnant. He doesn't even know if his daughter is his. Cause he caught her cheating multiple times. She found out he was in a new relationship with me and immediately took his daughter away from him. The only time he can see her now is if he's alone and she drops the child off at his mamas. I'm not allowed and neither are my kids who adore her.

I made the decision to withdraw my kids out of the situation when we were FaceTiming while he was over there and his daughter said that her mom hates "K" my 4 year old. I was shocked and livid and now I don't trust what will come out of her mouth when she's around my kids.

They have no custody arrangements so it's literally on his baby mamas time and only that and he can't do much about it because he isn't even on her birth certificate.

It's a whole mess and it just keeps getting worse and worse to where it's affecting our family life. I have 3 kids of my own and their dad isn't in the picture much so he's their dad. He lives with us too so this visits affect our day to day lives greatly. I know seeing his daughter is important and makes him happy. I have no issue with that, but our lives are totally revolving around his baby mama and I can't take it anymore. We've been trying for a baby and I had to tell him I no longer wish to have a baby right now with everything going on, and he got mad and upset about it and said it wasn't fair. I don't think it's fair that I'd have to be the one taking care of our family alone just to kiss ass to his baby mama and not take her to court. He's put it off for 4 years now and there's no telling when it will actually be over. I'm so torn. I love him I truly do but the drama and the controlling behavior is bringing me down and making me want to run. Any advice? Similar stories?