[He didn't really expect any other answer than what he got. He found himself sorry for things he hadn't done but sorry wasn't going to change much.]
If you need assistance- [He fell silent. If Dean wanted to speak to him, Cas was sure he would.
He wanted to say more but he couldn't find any words that made sense. His expression was one of tired regret as he cautiously met Dean's eye before the expression, and Castiel, were gone.]