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He didn't bring up his daughter because he doesn't take you seriously. He would never introduce her to you so he never mentioned her. He most likely just wants to sleep with you. The baby mama is letting you know he is a scum bag. In this case leave because why do you want someone that lies to you and doesn't see you as important enough.
Ask yourself if you are really in a relationship.
Does he know your parents?
Do you know his?
Does he intpduce you to people as his girlfriend? Probably not. Move on and thank god you were warned.