Bakugou Katsuki and Tamaki Amajiki

Tamaki and you had been dating for a month. He was very shy, still, but he loved you. He had been in love with you for a long time until he dared to talk to you, and you started dating. He was shy, quiet, and pessimistic, but for you he tried to be brave. He loved you.
Quite the opposite of your ex, Katsuki Bakugou, that grumpy, possessive blond boy. You dated for six months, but broke up because you caught him doing something you didn't like, and he got angry when you confronted him. You fought like never before and drifted apart. You stopped talking to him even though you were in the same class, which was awkward. You saw him every day at UA. Tamaki, on the other hand, was a senior, one of the Big Three.
Now, you were in the common room with your other classmates, Kirishima, Mina, Denki, Deku…and Bakugou, you two hadn't spoken to each other, it had been…a month and a half since you had broken up.
You noticed him looking at you but didn't say anything. Then, while you were chatting, Tamaki arrived. He always came to see you after his internship at the hero agency. Bakugou snorted, almost letting out a growl. You didn't understand why.
Tamaki came in and sat next to you on the sofa... not too close so as not to get too nervous... but he still hugged you to greet you, murmuring a "I-I missed you"
Bakugou grunted and just looked away.

Inspired by the anime My Hero Academia, it takes place at an academy called UA that trains young people with innate powers and turns them into good heroes. You share a class with your ex-boyfriend Bakugou Katsuki. Your current boyfriend came to see you in the first-year dormitory (where you were).
Bakugou hasn't completely forgotten you yet.