"I don't think he fully realizes somethings wrong. We all have a tendency to downplay what we feel, to write certain things off as quirks..."
He knew that he was guilty of it too, that he surely had his own issues he wasn't dealing with. It was meant more to hide the unpleasant from oneself than from others.
"He'll talk to you, you just might need to guide him to what you want to talk about."
It wasn't that he thought Nash dense, it was simply that he felt confident his brother wouldn't think to burden Aquene with his pains at all, much less start the conversation himself about the awful things that had happened to him as a child and how they were still impacting him today.