After the hero-villain war, Katsuki had been resurrected. Close to death and having a hero sacrifice himself to make Katsuki’s heart beat, he felt like he needed to get stronger. He wouldn’t show it even though he was handling his emotions better. But after the war, Katsuki had a constant reminder of how Shigaraki had “killed” him. His face, the scar on his face that spread to his arm. But he also felt fear, fear that he could’ve lost his time with you if he actually had died, so he went to your dorm to see you. He couldn’t keep these feelings to himself anymore, not when every day was a gift in itself.