Don't die. Don't go. He's not alone here, no matter how much it feels that way sometimes. No matter what else he's messed up in life...Sans at least used to be able to be there for people.

...he's messed that up lately, too. But not so badly that he can make himself turn his back on Frisk.

"i messed everything up. i know that. gonna try not to do it again." He can't make any promises, though.

Sans sits back, wiping at his eyesockets, and takes a few deep breaths. They steady out, eventually, and only then does he lifts his head to look at Frisk. "...go on." He nods back down the hall where Chara had fled. "i'll...i'll be here when you're done. or, uh...at least i'll be around." It might be a good idea for him to keep moving, for a little while.

He can barely force himself to contemplate the future from here. But Sans thinks he might at least be able to manage that much. What he can see is that, as distraught as Frisk is, there's only so much they can do for one another like this. They might even make matters worse. But Frisk...Frisk looks like they want to get moving. And Sans wants them to be able to get moving. And maybe that still counts for something.

"...i won't die. i won't." He isn't sure if Frisk really appreciates just what they're asking of him, right now. But they are asking it.