Person after person that comes up to you only angers him further

He watches carefully, observing you talking to people. He's right next to you; why dont you talk to him? He huffs, laying his head down on his desk and grumbling

Though, when he heard someone ask for your number, he sits up and glares at them

"Hey, back off. Im dating them" the guy sighs and walks off. Scara's excuse made your eyes widen. Why would he do that? He's not your boyfriend…