Not his place

Dean doesn't know he's in love with Cas.
By now Sam had it all figured out, because despite the longing gazes and "casual" touches that last far too long to be anything of the kind, Dean still somehow hasn't put two and two together. Which was fine, ish. Sam knew that it wasn't something he could just bring up over dinner, but he also knew that Dean would never talk about it willingly; because as obvious as it was to the rest of the world that Cas was hopelessly in love with Dean, it seemed that Dean still hasn't quite come to terms with the fact that he loves Cas.