Why does this guy interrupt when I talk with another guy?

Anonymous
There is this guy I know he has been flirting with me and I have with him. We stare at each other a lot across the room. This guy comes up and joins the conversation if i am talking with another guy. This guy will also leave me out of the conversation and talk to the other guy. Why does he do this?
Why does this guy interrupt when I talk with another guy?
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