He falls silent for a long moment. "I have forgotten nothing. It just doesn't matter. It's all just moments in time."

It's a cold way to view the world, and one not natural for Kyle at all - he cares too much, usually. But the corruption he's experiencing pushes him more and more to view the world as a big picture where individual lives don't take precedence.

It doesn't help that his attempts to repair things with Karkat helped push him to this.