You and Deku talked a lot, and Bakugo noticed. He's not happy* His dorm is next to yours, it's late, he's making his music really loud, he's drowned out his feelings for you in his own way You were tired, so you go to his dorm and knock to tell him, he asks him to refuse. "What the fuck do you want? It's late." should make you happy, not Deku*