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?

[Decentguy]

maybe he interrupts you because when your talking to some other guy he doesn't like that.

[Anonymous]

I have no idea. You should ask him.