Is it bad for a guy to spend a lot of his time with his girlfriend and her child but never with his own children?

My boyfriend spends a lot of his time with me and my family + with my daughter but he doesn't see his own daughter and his other kids. He blocked his kids mothers because he's with me, living with me and my family. Is that bad?
Is it bad for a guy to spend a lot of his time with his girlfriend and her child but never with his own children?
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