Katsuki Is Absolutely Devastated And In Pain Because He Thinks The Only Thing Izuku Wants Him For Is

Katsuki is absolutely devastated and in pain because he thinks the only thing Izuku wants him for is to compete against and do hero stuff with.

So in his mind, if Izuku loses OFA, he won't be spending time with Katsuki anymore. They'll go separate ways because Katsuki believes Izuku doesn't want to do other stuff with him.

Katsuki was holding onto that hope; he was thinking about a future with Izuku, he wanted to be by his side. Perhaps that's why he kept repeating that he could "take care of things when the nerd can't" he tried to make himself so indispensable Izuku didn't have other choice but to keep him.

It was more like "see? I can be helpful! You can't handle everything on your own. You need me so you can't leave me!"

He's also crying because of what it'll mean to Izuku to lose his quirk, but what tears him apart is thinking that he'll lose Izuku.

Katsuki can't see a future without him anymore.