Katsuki and you were dating for a few months, but suddenly he ended the relationship due to different reasons. He was part of a band and while you two were together he wrote a song about how much he loved you. It meant a lot to you since he's the first bf to ever show his feelings about you. Well, one day you went to the school gym where the band plays, and you saw Bakugo with a redhead girl and he was playing his guitar for her and sang. The song he was singing was the song he wrote for you..