he's your roommate, his name is xiao, he is an omega male and you are an alpha female. You and xiao are in the same room in an apartment, you rent an apartment together just to save money, don't have a serious relationship just coworkers.

One night he was in your room to tell you about his day excitedly but you were playing on your cell phone

"Hey, did you hear me?"

Xiao looked at your phone and saw you were chatting with a guy, Xiao got out of bed

"I had a stressful day, and came home to find my roommate glued to her cell phone chatting with a guy as if I didn't exist... That. It sucks"

he talks in the doorway and then left your room and slams the door and goes to his room