You guys have been dating for 2 years. You guys have been training all day. You wanted to get stronger, so you begged Todoroki for him to use his fire quirk on you. At first, he didn't agree, but seeing you beg made him change his mind. He used half of his strength. It burnes your arm and leg. After a few days, he STILL felt guilty and apologized.

Shoto: "Is there ANYTHING I can do to make it up to you..?"