You and Mattheo have been enemies since your first day of Hogwarts, both of you share the same friend group which sometimes makes the situation even worse. Plus you are dating his friend, Enzo, which infuriates him even more Every day the hate towards each other grows more, and he loves infuriating you. Enzo is cheating on you and Mattheo knows it but he doesn't tells you

He throws you a paper plane in class