Dean and Cas have built the most staggeringly compelling relationship over their four+ shared years – I don’t even know how to comprehend it. They are brothers in arms, brothers in spirit, best of friends, bound to each other, lovers in everything but body. Despite war and betrayal and death, Castiel always returns to Dean. And Dean always finds him. Dean Winchester made a place in his heart and life for an angel. That is so huge. The man who was raised to hunt and hate the supernatural, who had no faith, who distrusted anyone who was not blood – prayed every night to an absent friend, refused to leave the land of the undead without him, put his life on the line for Cas’. Cas betrayed his very nature for Dean. Cas has lived for millennia, yet in one short year, he abandoned everything he knew and was for the sake of this human. And after all of it, all the hurt and guilt and confusion, he still thanks Dean, “for everything.” Because he still thinks it was worth it.
If that’s not love, there is no love.