We need to talk about Dean’s body language when he talks about Cas. - He cannot look right at Sam. He hides his sorrow away from his brother. - His voice is similar to the way he spoke to Castiel by that river. The difference is clear especially in season 8 when Dean tends to speak with gruff/hoarse voice that almost like a bark. - His face. I don’t need to say more.
it’s very similar to season 4 scene, when he’s talking about hell, dean just can’t hold it in anymore… :’(