Another way of saying "I love you" by Dean Winchester

DEAN:We'll figure it out. Cas, buddy, I need you.
DEAN:And if Leviathan want to take a shot at us, let ‘em. We ganked those bitches once before. We can do it again.
CASTIEL:It's too dangerous.
DEAN:Let me bottom-line it for you. I'm not leaving here without you. Understand?
CASTIEL:I understand...