My take on what I refer to as "the joint passing scene", Jack has told Ennis this story about the ranch forman's wife and all, then he says "The truth is..." and after a pregnant pause where he probably thinks better of telling the intended truth, he tells Ennis he misses his so much he can hardly stand it. Then the next day in the parking lot, he does seem to expect something to happen, some relevation, in the story "this said and unsaid".