From what we see and are told in the movie, apparently Luke didn’t even try to talk to Ben before going to him in his hut. And that’s just insane for me. We’re talking about the guy who surrendered himself to the Empire to have some alone time with Hitler to try to convince him that he’s actually a good guy.
Luke said that he had sensed some of this during their training, but had to be sure. It really doesn’t seem like the kind of thing that you ask someone about as a primary way of discovering the truth.
I respectfully disagree. To me, trust is the basis for any relationship, and not just romantic ones. So yes, Luke should’ve talked to Ben before anything. Talking to him would also trigger several of Ben’s inner thoughts and feelings that Luke would be able to sense, given the subject of their discussion, and because Ben at that point probably didn’t know how to close his mind from a Jedi master.