“Your not.” Cas informed Dean sternly. “sit down.” he winced a little as he rubbed the back o his neck. A nervous habit he’d picked up over the last year. “i’d never seen you happy before.” Cas admitted to Dean. “you where smiling. Laughing even, you looked so relaxed… neither of us wanted to ruin that. Sam had his chance at a normal life and he chose to give that up… you never had a chance to try it. We wanted to give you that chance. You wouldn’t have stayed if you knew. You wouldn't have let yourself have this chance… so we decided to just leave you out of it, since Sam had his own backup. He’s been working with your grandfather, so he’s been safe.”