Egads. Sounds like one of the guys I've played tabletop RPGs with in the past. He'll have a character, clearly a minion of someone of questionable morality, and then when the time comes to complete his character's part of the bargain, his real world morality gets in the way. Very frustrating, especially since he's not consistent with it so you can't anticipate what game events will trigger a game-breaking response.

He's still in a couple of groups, but if the game dies for reasons other thna scheduling conflicts, it's probably his doing or a TPK.