[He knew, as soon as he phrased it this way, that Keith's conclusion would jump to his disease. It still feels like lying and he feels bad for it, especially when Keith bombards him with the questions, can tell he's holding back more.
He reaches out to take his hand again, gently, to reassure him.]
Yeah, it was bad. But I'm okay now-- I promise. It doesn't hurt. [Squeezes his hand, gently.] You've been helping me. So I'm okay.