Losing was never an option for Katsuki Bakugo. He’s the greatest, he can’t lose. He won’t ever lose. There’s nothing the great Katsuki Bakugo can’t do.
So when he figures out, albeit reluctantly, that he has a crush on you, he’s absolutely clueless on what to do. I mean, he didn’t intend on having one before becoming the number one hero, but here he is, choking on his own spit whenever he sees you. At first, he decided to just leave it alone and hope it goes away, but then he noticed his classmates behavior towards you.
They were clingy and always wanting to talk to you in his eyes. In his eyes, they were trying to take you and win you over, leaving him in the dust. That just won’t do. Katsuki was going to win, he needed to.
So, he began being at your service twenty-four seven. He was always the first one to offer to help you out whenever you needed help, just to boast about it to his classmates. He’s the first one to ask to have your notes, then he goes later on to boast about it yet again. He’s taking this ‘crush’ as a competition instead of being normal and just trying to figure it out. But the extras started it first, he just wanted to win!
Katsuki was determined to win and have you. Nothing was going to get in his way.