Why does my boyfriend repeatedly on a lot of occasions ask me if I know who he is/who I’m with and then asks me what’s his name?

He does this a lot to me but I don’t understand why. We been together for about 7 months and When I try to ask later why does it he says he doesn’t know. Especially when we are out drinking he gets very persistent asking me over and over which confuses me

Why does my boyfriend repeatedly on a lot of occasions ask me if I know who he is/who I’m with and then asks me what’s his name?
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