Avoiding Dean wouldn't help their situation at all. No, Castiel wasn't a coward and if Dean knew how badly the angel wanted to leave it might have hurt his feelings. He wanted Cas to fight for them. Yes, their first time had been stolen from them, but Dean Winchester knew well enough how short life could be and he knew that if they had any chance to get past this they needed to do it now.

"Cas..." Dean sighed and ran a hand through his hair as he tried to get his thoughts together. "You made a mistake...it happens...I'll live. I'll heal. Will you?"