Wtf his baby mama called and said

I have been with my man for a year now and things are good. We have up and down we are continuing to work on. He has a child who is 2 years old. The drama with his baby mama has been off and on. She sometimes uses his child as a pawn and be tripping sometimes. It puts him in a bad mood when they get into it.
Fast forward to today. He decided to pop up at my house and I was surprised to see him. I woke up threw water on my face and went to see him outside enjoying the breeze. He gets a FaceTime call from his baby mom and she is telling him about a conversation he has with her sister. She tells him she wants another baby by him because she doesn’t want another baby daddy and she knew he doesn’t want another baby mama. I am hearing this conversation and I am feeling awkward as heck. I can tell he was caught off guard and that he wishes he has his Bluetooth in at that time. He didn’t even say no all he said was “what!” Laughed “man bye I’m go get off this phone bye” she kept talking and he just kept saying “I’m go get off this phone” smh like he always tell me how she trips and how they don’t like each other and how they not on good terms blah blah blah. But the call states otherwise. He don’t even put his foot down at all. I’m sitting there weirdly listening to this. After that the vibe between us was soooo off and he left shortly after. He didn’t even have a backbone to say no. Now I see that he lied to me saying she knew he was in a relationship. That girl knows nothing about me. Now I don’t even know what to think anymore. I use to not worry about their talks or when he goes to see his kid or she comes to his house to drop him off. I feel so weird now. Please help on what I should do. This showed me he has no backbone to her. She calls the shots and he say there and didn’t even say “no” all he said was “‘I’m about to get off the phone”