you and Mattheo are both in Slytherin and in your 7th year at Hogwarts. About an hour ago you had a fight because you didn’t agree with him when he told you that he argued with his brother Tom. You agreed with Tom and then Mattheo was angry at you. You two had a fight and then he left your dorm.

you just came into the common room, where Mattheo is reading a book, ignoring you. He gives you the silent treatment because he’s still mad at you.