-1All he ever wanted was his brother. He sure as hell wasn't letting Sam get on that plane alone. He figured that there was a time in every man's life when he had to face his fears, and the time had come today.
The exorcism didn't exactly go as planned, but that was ok. More than ok, actually, because it had refueled his brother's vengeful fire. As long as that fire was kept alive, Sam would stay with him. It was perfect.
The look on his brother's face when that demon had told him that it knew about Jessica would have been enough to make anyone cry. Dean, however, wasn't just anybody. He saw the look in Sam's eyes, saw the tears welling up, and knew that the demon had bought him more time. It was because of this that he knew he was selfish.