[He's sure that-- something must happen, something has to have happened if Allura can help him, that Keith must have found him somehow... and yet, still, those words make him clench his eyes shut for a moment, against that wash of sadness, of longing. He got used to the idea that he would die young, after all, got used to knowing that, eventually, the world would be without him. Actually dying hadn't been as bad as he'd feared, after the initial pain, but it was being stuck in one place, on his own, that'd been the worse. Being alone. Never being sure if this was it or not.
Keith's words, though, remind him of everything that's left out there, that quiet knowledge that even, through all of this, Keith might still lose him someday. And how, despite all that, he isn't so selfless as to push Keith away. Wanting him here, wanting to always be with him-- even if it hurts.
For now, though, more than anything--] I'm here, Keith.