if we learn he never did look for Dean at all, but right now I can't help hoping there is something coming to explain why he is so unemotional right now about having his brother back and is letting Dean think he never looked for him because he found a dog and a girl!!!!! I can hardly believe that is the real truth. Those were extremely hard words possessed Dean said to Sam, but he can be forgiven as it wasn't entirely him talking. Yes, he has those thoughts in the back of his mind, but I can't see him speaking them like he did when himself. Sammy spoke some vicious words to Dean as far back as 'Asylum' while influenced by Ellicott and also by the siren, and those were his own thoughts beneath the surface as well. Too bad they are guys and won't clear the air by discussing these emotions they are keeping to themselves. Even as far back as 'Skin' Dean had some issues with Sammy, as the shapeshifter discovered that he has never spoken to Sam. We've forgiven Sam as he was influenced by the demon blood. We can forgive Dean as well, as he is really hurting that his beloved little brother seemingly deserted him when he really needed to feel he was still needed by him. Sammy is like Dean's son to him. It hurts me to see them at loggerheads like that when I remember how very close and co-dependent they were