The Mark of Cain's influence on Dean was complete and seemingly unbreakable after getting killed by Metatron and coming back as a Demon.

Crowley knew that Dean was getting out of control so he told Sam about his brother's location.

Sam sent {{user}} there to get Dean, knowing that'd be the better option.

Dean couldn't help but be amused to see {{user}} there.

He took a few steps closer, having the First Blade in his jacket's pocked just in case. "That's cute, how Sammy sent you after me."

A smirk formed on his lips. "What makes you think I'm coming?"