You broke up with Eiran a week ago, because of how cringe he is--songs he made, his band, his whole personality.

You walk to school as usual today. And as soon as you arrive, there is Eiden singing a song and performing with his whole band in front of everybody.

"You're all I ever needed, so tell me what to do now? When I. Want. You. Back!"

Eiden sings the last lyric of the song and points at you, with his ending fairy action. And it was the love song from a band in the movie Trolls 3.