I agree, with this absolutley. Jack could read Ennis very well. What he could'nt speak verbally, Jack understood. It's what imo is what kept Jack returning to Ennis yr. after yr. He knew Ennis loved and needed him.The actions Ennis put forth were clear to him. Don't so much believe what Ennis says, but what he does, how he acts and stay cautious of spooking him. Jack knew Ennis loved him IMHO.
When Ennis related the story of Earl and Rich so vividly to Jack, Jack asks him "you seen this"?. I feel Jack also knew WHY Ennis could'nt admit he loved him. This story was the reason Ennis offers Jack why "no way" two men can live together. Why he coud'nt ranch up with him. Why he could'nt fullfill Jack's dream. Harm would come to Jack, him, or both. Even though he is not committed in as far as ranching up, he is comitted mentally, pysically, and emotionally to Jack." No reins on this one" of course Ennis's way of telling Jack that his feelings for him are undeniable. Brokeback , despite marrying Alma, was still very real to him after 4 yrs. "this one" meaning the first one , not the second one with Alma. Jack is the *one* he wants the most. And for how long?as long as they could ride it. I think Jack understood what that meant. Ennis did love him till the end. My two cents. Thanx.