Girlfriends coworker is flirting with her?

Anonymous
Well my girlfriends coworker is recently starting flirting with her, and it pissing me off cause he knows she's has a boyfriend and I feel like that's a slap to to the face. I don't know what to do. We talked about it, I don't know if I should confront the guy to tell him to stop? Or no because I don't want my girlfriend getting mad at me cause that's her friend..
Girlfriends coworker is flirting with her?
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