[As the realization of what he's done sinks in, guilt and horror mix together, washing over his face in an uncomfortable display of emotion. His voice breaks as he tries to speak again.]

D...don't ye see? I wished that I was the one to make ye happy, and this happened.

[Just seeing her like this tears at his heart, and knowing that he is the cause of it makes it that much worse. He was selfish, and stupid, and now she's in pain because of him. And although there's a part of him that wants it to be real, that wants her to be with him, he can't let it be because of something like this. Unless she pulls away again, he lifts a hand to touch her cheek, letting that small gesture tell her how he feels.]

I'm sorry, Kaylee. I could love ye, so easily, but this isn't right. I wish I never made that wish in the first place.