Jensen on why Castiel left Dean alone in the Purgatory:

onamelancholyhill:

supermishamiga:

“There will be an explanation as to where he went and what he did. He maybe just had gone to the bathroom real quick and will be coming back. Who knows. But yeah, it wasn’t an abandoned ship. Where he goes is gonna be revealed throughout these flashbacks. It might be even something like he had to lay down himself in order to save me. That all will be revealed. Later.”

(x)