I'm really curious about what happened to him too! 'He learnt his lesson', he said, how exactly? What was done to you, dude? *wants to know*

Yes, it was painful to see Dean like that. It's not even the first time he says he's 'tired' but it's the first time when it felt like he almost had nothing to give anymore...

I'm really not sure about Sam's reaction. He seems so far gone!

I know! The whole thing is just scary.