You and that whole friend thing, man.
Wanted to gif this scene myself because it was easily one of my favorites from season 8 so far.
Benny is trying to protect Dean here. He knows the business he’s going to have to deal with when he reaches his den and faces the man who turned him is going to be dangerous, and beyond that it’s a reminder of his past, which he isn’t proud of. And maybe it’s because he doesn’t feel that he deserves it, because of what he is, or because of what happened in Purgatory, but for whatever the reason, he doesn’t want Dean to risk his life to save his own. But Dean won’t let him off so easily.
I think this scene, even more than the hug from 8x01, shows how much Dean has come to care for Benny, not just as a friend but as a brother. Dean would never let Sam go on a hunt alone, no matter what the reason. Dean has no idea what business Benny is talking about at this point. All Dean knows is it almost got Benny killed, and Dean can’t let that happen because Benny is his brother. To Dean, nothing matters more.