Cas

First of all, I just want to make a point of saying, Castiel is not innocent. He is not guiltless. He should have asked Dean for help when he was diberikan a chance instead of going with Crowley and he definitely should not have made a deal with the devil.

But, on that, I’m going to say Castiel was probably panicked and scared. During the apocalypse, he Fell - loosing all his powers, he discovered his Father would refuse to help him, and he died. Obviously that’s not something he’d like to relive. Not to mention Dean. Dean was his best thing who lost so much, he didn’t want to put him through...