Castiel: The plan changed, Dean. Something went wrong. You know this. Something always goes wrong.
Dean Winchester: Yeah, why does that something always seem to be you?
Castiel: You used to trust me, give me the benefit of the doubt. Now you can barely look at me. My powers are failing, and… and I’ve tried to talk to you, over and over, and you just don’t want to hear it. You don’t care. I’m… dead to you. You still blame me for Mary. Well, I don’t think there’s anything left to say.
Dean Winchester: Where you going?
Castiel: Jack’s dead. Chuck’s gone. You and Sam have each other. I think it’s time for me to move on.
From Supernatural – Season 15 Episode 3: ‘Rupture’ (15×03) | Produced by The CW