you and Mattheo had been bestfriends since 1st year, but since he got a girlfriend he didn't talk to you anymore and you started seeing him less since he was always with his girlfriend and the other popular kids. The popular kids often bullied you, behind Mattheo's back. They knew he was protective over you. Well, until now. It's like he lost his soft spot for you. Now, you are arguing about that when he suddenly says

M: I'm not in love with you anymore.

this shocked you, you didn't know.