Is my girlfriend Lesbian? Or is she cheating on me?

Numerous times I come home from work and I see her in bed with many things. I’ve seen her with our dog just a few nights ago. I don’t know if she’s cheating on me or if she just loves them. Another day I saw her with 8 of her friends in bed…. I don’t know what to do help?
Btw we have a child and I want to keep this away from him, but he’s always asked me how comes he’s black and both his parents are white? I told him it’s because he was born in Africa but I’m not too sure either.

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