I love how looking at Sam’s reactions can show how different his relationship with Cas is as opposed to Dean’s. Whenever Cas does something wrong and doesn’t communicate, Sam is always welcoming Cas back with open arms. Sam’s just glad Cas isn’t dead in a ditch. It’s platonic.
Dean though? Dean’s always a mess. He’s so worried he’s angry and volatile and it’s usually always deeply stemmed from feelings of neglect and abandonment from Cas. So when Cas returns with an apology, Dean throws it back in his face. There actually has to be a follow up scene between them to mend Dean’s hurt. That’s not platonic. That’s some romantic shit. Dean reacts like a lover scorned.