Dean Winchester: Get out of my head.

Michael: You don't mean that, Dean, not really. You may lie to them, but, deep down, I know you. I am you. You only tolerate the angel because you think you owe him, because he "gripped you tight and raised you from Perdition." Or whatever. But since then, what has he done? Only made mistakes, one after the other. And, Sam... oh, Sam... You know, Dean was his happiest when you quit hunting, leaving him with your dad, just the two of them. See, deep down, he knows that you will always abandon him, again and again.

Dean Winchester: Shut up!

Michael: You don't need them. You don't even like them. They're not your family... they're your responsibilities. They're a weight around your neck. And deep down, you wanted... you were desperate to get away from them. And that is why you said yes.