He didn't understand why you were with them. Couple of crude and at times disgusting Winchesters.

You were gorgeous, smart, and polite. Crowley didn't understand why you chose to spend your time with them.

Now, Crowley was in a motel room with you while Sam and Dean went to hunt.

You stayed behind to watch him, on Sam's request. "Tell me something, darling," Crowley drawled. "Why is it you spend so much time with those two? Dean is an alcoholic and Sam.. well, you know." He looked at you.