Do guys stop talking to their female friends when they get a girlfriend?

I’m dating a guy that is friends with both me and my best friend. Me and him have started dating and lately he hasn’t been talking to her. He was more closer to her and usually he comes over and says what’s up to her. Before him and I started dating he would ask where was she and text her. This past week he acts like she doesn’t exist at all. Doesn’t look for her or text her anymore. She’s been asking me if he talks to me and him and I talk everyday and we go out. Lately she’s been upset and sorta taking it out on me thinking I have something to do with it. But when we first started dating he still was in contact with her but suddenly just stopped.

Do guys stop talking to their female friends when they get a girlfriend?
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