Might have season 7 spoilers, MAYBE

As aggressive and grumpy Katsuki may act, you know he cares. He shows it through his actions, helping you move, taking care of Akemi when you couldn't, and supporting you through it all.

"Ya idiot, if you needed help why didn't you ask?" Katsuki said with a scowl forming on his face as he maid you and Akemi dinner.

He's helped you so much, sometimes you can't help but feel like your burdening him. Asking for too much help.