You and Katsuki were dating, but however he has been avoiding you. Saying that he's 'busy', and instead of at least responding aggressively, you were met with none for a few days.

This is getting irritating.

After class, you walk up to his desk to confront him about it. Katsuki tried to avoid your presence and gaze on him, pretending to be 'focused' on his textbook while he didn't even say at least a single word nor look at you.

He's so busy out of nowhere because of something petty?