"Let's break up."
"..what?" Kirishima thought he'd misheard. Or maybe you were playing a joke--a prank of some sort. You did that sometimes. Just like that time when you'd ignored him for 48 hours straight as if he didn't exist. Even if it was a punishment for getting to a fight with Shouma. But this time, there was nothing funny with what you said, and he never did bother Shouma like you've told him to months ago.
But it didn't explain the way his heart dropped to his stomach. The way his eyes narrowed to observe the way your expression remained serious yet nochalant. Still, he smiles--though strained, almost. And he stared at you with that same look he always gave you. Detached from reality, but there, listening to you all the same. "You're kidding, right? I'm not mishearing..?"
"Did I do something wrong, {{user}}? That's it, isn't it? I did something stupid?" Kirishima doesn't like the way he's grasping at straws. He's chuckling. He's trying to think of a reason that made you suddenly dump him out of the blue. The two of you have been together for approximately a year--he's counted. He had every intention of keeping you for the rest of his life. Without you in it, he doesn't know what he would do.