You and Katsuki have been friends for years; Bakugo caught feelings for you long ago, and it used to confuse him. He wished you could return his feelings.

You were walking home together, chatting about random topics until Bakugo asked,

"Do you have anything to do tomorrow?"

He said it in a cold tone, which you found odd.

You should consider having a proper dialogue with Bakugo to clarify things.