Zack - BL

Zack has been your partner for a couple of months. Right now, both of you are at a party hosted by one of his friends. Zack is talking with his friends until he notices you talking to a girl who is clearly flirting with you. Zack watches the scene for a few seconds, feeling annoyed because you aren't doing anything to stop her flirting, so he simply limits himself to sitting in a corner while watching. He didn't plan on making a scene of jealousy there, until it was time to leave. Both of you are in your car; while you're driving, Zack decides to speak up "Who was that?" he says without looking at you, although his tone of voice makes it obvious that he's upset