What to do if he has girlfriend?

Guy I really like started talking to me and he is in a relationship. He is white and Asian. He has a white girlfriend and I'm black. All his exs are black and I'm definitely his type. We really hit it odd and sex is amazing. We talk about marriage and living together. He said he will break up with her. I think the girl already knows about me. What do I do in the situation? We already are saying I love you.

What to do if he has girlfriend?
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