I don’t know if Nick has reached “screw it” mode yet so much as he’s running on autopilot. He hasn’t even had time to reach the level of emotional doneness that leads to “screw it” mode. I think he’s dealing with each thing as it comes and not really processing each fresh burden or trauma…and yes, I do think there’s a limit. Nick is still human, after all. There’s only so much most of us can take before we break down. I hope he has a chance to stop, take stock, and deal before he gets to that point.