Bela is a great thief, yes. What always bugs me is the way the boys always seem to forget that they hate her and she can't be trusted. They go through all the 'Bela, crap' stuff, and then instantly let their guard down around her, when they should be a lot more wary.

I suppose they can be forgiven for being distracted in this episode. But they really shouldn't trust her as much as they always seem to, given their history with her.

Dean breaks me into small pieces every time I watch that part of the episode!
Oh Dean. It's like all season he's had to be stoic and face his fate without wavering, because how could he say to Sam 'well, I made this huge decision to save you on the spur of the moment, but now I've had time to think about it I don't want to pay the price', especially knowing that not paying the price will cost Sam's life? He just couldn't do it, couldn't imply that he doesn't think Sam is worth paying any price. It really hurts that it's taken this long, and he had to be pushed this far, before he could say out loud that he doesn't want to die and be turned into something else.