Ennis loved.
He loved his father, which made the father's terrible act of showing Earl (?) to Ennis all the more traumatic.
Ennis loved Alma, just not enough. He defended her to Jack.
Ennis loved his children. He would not even think of moving to Texas away from his children--a stand I respect very much; and I don't think Ennis gets enough credit for this. He also, it seems, makes all his child support payments, allowing the kids to live in that "nice" home we see at Thanksgiving. Also, if he did not make the payments, he would have been arrested. He sniffs Jr's sweater as he's putting it away to keep her presence near him. And he's going to make time to be at her wedding, because he realizes how badly she wants him to be there.
Ennis loved Jack. He would not have thought about it with these words, but he loved Jack. He did not--could not, at least at times--express it well, cetainly not with words. But his body expressed (maybe unwillingly expressed) his love--the dozy hug, the wink, the reunion kiss and nuzzle, stroking Jack's arm in the the motel. The dry heaves. Even the fight.
Sniffing the shirts. Hugging the shirts.
He still can't find the common words... just, "Jack, I swear..."