[Makes a soft sound and moves his hand to cup his cheek properly again, touch gentle but present-- not wanting to break contact with him, now that he's allowed to touch, now that he's actually able to feel things again.]
I... I know that, too. Keith...
[He also knows that without him, Keith would have gotten there eventually. Because Keith is amazing and strong and worthwhile to the people he meets. He underestimates his own influence in Keith's life, what a surprise.]
I know... what sort of person I'd be if I never knew you, too. [Closed off, unsupported, lonely. He knows, too, what it feels like to have yourself cut off from those feelings. It's likely not necessary for him to say he doesn't like how he was in that instance.]
I'm always going to be grateful you're in my life.