"I can remember that I used to do a lot of work with timeline theories," he says carefully, after a moment of silence. He thinks he knows the answer to this part, at least, but he doesn't really relish explaining it. "Eventually we noticed that our was in what you'd call a loop."

He meets Papyrus's eyes for a moment, but can't hold it much longer than that. He looks down, tracing pictures on the floor as if they are intended to help illustrate the idea.

"The why is complicated. Point is, certain triggers have been making things repeat back to the start whenever certain... qualifications hadn't been met. It'd been doing that for a long time. A lot of the time I think we'd just get a bit of deja vu from the thing, but over time I started remembering things."

He doesn't go into detail on that. He feels like the implications are as clear as he wants them to be. He puts a hand to his face, exhaling harshly as the reality of what he just admitted to settles in. He's never explained this to anybody that didn't already know, before.

"Just kinda starts making things feels pointless, y'know?"