He doesn't talk to her. Yet he wants me to play on her phone. Is this even normal?

My boyfriend has been ignoring his pregnant baby's mother her whole pregnancy. She's 7 months now. But at the same time, he wants me to play on her phone. We actually called her together. And she was like, "what's the point of you ignoring me then playing on my phone with your girlfriend". Which i asked him the same thing. I feel like He's got me doing things to her on purpose because she slept with his cousin years ago. Which she said she didn't know. Is this even normal? He lets me argue and pick with her and never told her we were together. Every time she texts him telling him im bothering her, he doesn't text back. I read everything from her. He leaves his phone with me to stress her out ig. 🤷
He doesn't talk to her. Yet he wants me to play on her phone. Is this even normal?
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