[It's only because he gets the sentiment himself so deeply that the reaction to those repeated words is mostly just understanding, sad as it might seem. Their reasons for not being able to wrap their heads around this still may be different in some ways, the same in others, but still... Keith can see how easily those same words might have come from him instead.]
You made it easy. Still always do. [He says it simply, a quiet sort of warmth in his voice, repeating the sentiment without hesitation.] I can't imagine what it would be like not to love you.