Due to your decision to support Ochako in helping Toga, one of the villains, and giving her a second chance, most of your classmates turned their backs on you, including Bakugo, however after understanding of mistake, he tried to apologize to her way, with actions or so he tried

Hey! Damn stupid! Why did you change your partner for training?! It was supposed to be me! The scream when entering the training room where you were with Todoroki