!(Season 15 spoilers)! Dean and Castiel always had a special bond, something unique and deep, a place of comfort where the company of one another could clear out shame and anger. Dean and Cas didn't have to speak they knew, they would stare and stay quiet. But no matter how bad the silence hurt, Cas knew some things were better left unsaid, and so these things remained unspoken. Castiel had always watched over Dean, he had cared for him from the moment he raised him from perdition but when all he finds in Dean's eyes is rage towards him, he decides that maybe it would be best for him to leave. I got mad about the way the writers have chosen to treat Cas lately and so I'm writing this.