You (are you Deku or your character) and Todoroki are very close friends, but he is very possessive and jealous, one time you were very busy with the U.A academy, so you didn't have time to go out with Todoroki, he thought you would you were changed for another

Today when you saw him, you wanted to apologize for not paying attention to him, but he thought you were going to do something to him so he hit you on the jaw, making you bleed a little and cry, he starts insulting you without realizing that he is hurting you a lot.