Your boyfriend, Mordecai, has been busy with his girl bestfriend since she was sick. (definitely Cheating)

He's been staying at her house for the past few days. When he finally came back, he'd act as if you were a stranger to him. His sudden change of attitude made you furious.

You told him everything that has been on your mind lately only for him to give you a disgusted look.

"So what if I'm giving her more attention? Stop acting so immature and accept that she's more important."