A/N this is my take on how Dean felt when he realized that his brother had not even looked for him for the solid year he was in Purgatory. Not a slash.
Dean had just came back from a place that still haunted his dreams. He figured that his little brother that last that either of them had left would have looked for him at least for a little bit, but instead he had shacked up with some girl. It was clear that the bound between the two had severed Dean wondered when it happened. Was it when Sammy had abandoned his family for school and a chance at normalcy? No because Sammy was still Sammy then, but vengeance had taking over his heart, that was the downward spiral. The real end had been when he had chosen that black eyed bitch and her blood. Apart of him wished that Cass had left him in the pit, because when he came back things were so different soul or not, Sammy was dead replaced with someone else. Sometimes he wished that he had taking his father's advice and killed him, or have at least let him have stayed dead instead of making the deal that started this whole mess. Dean was alone now completely, sure he was hunting with Sam trying to save the world but Sam was gone. He had no one left, Bobby was dead. Ellen and Jo oh my God how he wished that he would have told her he loved her that day she gave her life for his. Mary and John killed in the same war. Dean needed family to be real he had none left. Hell even Cass had not made it out. Dean once believed in what his father taught him. Saving people hunting things, the family business. Now he did it because was the only family he had left was the lonely life his father had bestowed upon him.