Dean flinched a little when the water smacked his face (because there was water flying at his face), and wiped it off like an irritating inconvenience. He should have seen that coming.
"It's not you," he insisted, wiping his hand on his jeans. "Maybe I'm just done humiliating myself in front of you, all right? It didn't work, and if it had killed me, then what? I remember waking up as a demon. I don't need it to happen in front of you or Cas. It ain't about leaving you out, Sam, I'm fucking ashamed that I'm even in this mess. Constantly failing in front of you is goddamn exhausting."