am I wrong or justifiable?

Denise • Expecting our rainbow baby in March 2018 🌈💙💚💛💜

Advice needed here! My ex an I have a 5 year old daughter. My ex started dating someone else. They split and in that time we were going to work things out. His ex came back pregnant. I was supportive as hell. Even bought things for his new baby, helped him file custody paperwork, and accepted. I also found out I was pregnant during this time. Here's where my Lifetime Original movie gets really fun.

His ex stalked me. Her family did the same. I have screenshots he sent me of crazy messages from her. Saying at 29 weeks she was having an abortion if he didn't talk to her ECT. I have multiple messages from him saying she's crazy. Even saying she told the father of her first child that he was dead after a miscarriage because the father wanted visitation.

Fast forward she has the baby. Suddenly I am left alone, pregnant while he's back with her!!! Now they are having sleep overs with her oldest son (8) sleeping in the same room as my daughter. I have requested until a court deems this chick mentally ok to be around my daughter that he not have her around. He refuses. After a year if being told And seeing she is not sane I have genuine concerns. I have given him a choice and he says it's none of my business. While i agree who he sees is not my buisiness I dont agree with her. If 3 months ago he wanted to take thier child because of her mental state why is she okay now?? In fact he says he won't keep her away until court "and that's final" Am i wrong to keep my daughter from him? He says I'm jealous but the truth is that feelings aside this is 10,000% about my daughter