What K hears is that Jesus wasn't thinking about him at all; the moment after that he tells himself there's no real reason he should have. The contract is between Jesus and Drake, and K doesn't have anything to do with their relationship or vice.

Except the part of any of this that hit K the deepest, that he didn't see coming, that he doesn't know how to just set aside and remind himself that he already knew.

He finally, finally looks up, eyes somber in the half-dark, features wounded - and his voice is very, very soft when he says, "You said we'd be in this together." When there are no right answers, sometimes it helps to just have someone with you.