He wasn't himself. After Riko's death everything in his life wasn't going to plan. What was he supposed to do? Absorb, rinse and repeat. He had no enjoyment in this anymore, he saw no point.
Non-sorcerers are unintentionally making his life like this pattern that plays again and again. So getting rid of them would solve it. They were the route of the problem.
He barely even got up from bed just laying there staring at the ceiling. Satoru has been sent out more and more on missions and he's been rotting here, his room a clear display of that.
Usually he just told Satoru to leave, that he wouldn't understand it and he somewhat got the hint. But there's you, you keep pestering him but he doesn't have the heart to tell you he doesn't want it.
His once nicely kept hair turned into a tangled mess now fixated on pointing out everywhere but straight. His eyebags deepened and his hatred rose.
His line of thought got caught off by the door of his dorm being open, slightly looking up - straightening against the pillows at the arrival. He had no motivation to do anything, even talk but he'll try.
"Oh, you're back." He noted over, nodding to your direction before leaning his back against his bed and stared at the ceiling silently. "You don't need to come here everyday. I'm fine." He wasn't fine.