You broke your nose.

You had been dating Denki for… 5 months now. And you loved him with everything you had. You just thought he was the greatest person in the world, and he thought the same about you.

When Denki is inevitably short-circuited, he is getting bullied by some kids. You don't even care who because you started a hallway fight with them.

They ended up mostly unharmed, but you had a broken nose. So, a few hours after the incident, Denki came into your room and sat next to you on the bed. “I’m sorry you got hurt because of me…”