Hmmmmm, interesting, but I feel a bit like my imagination is being stretched like salt water taffy to pull it off! But then, I say things that make people's imaginations do back flips, so... hmmmmmm, not sure why I can't go more a than a mile or two with this one, but again, it's interesting. But I hate to disagree without offering an alternative view. Perhaps where love is concerned, I look for something more traditional-- if such can be applied to male lovers...
When Jack and Ennis are talking about the future and present in the first campsite by the brook and Jack makes his actual "proposal" with "You know, it could be like this, just like this always.." They talk about past and present situations, feelings, Alma etc with Ennis saying no, "It ain't gonna be like that." But in the end, Ennis does give in as long as the bond is on his terms i.e. "... together, way out in the middle of nowhere".... And Jack asks, "For how long?" Ennis, "For as long as we can ride it. There ain't no reins on this one". Always... as long as we can ride it... Then Jack leans over and caresses Ennis which amounts to "the wedding kiss" without a bride! That, to me, is the commitment vows and ceremony, done alone between the two of them because, "Ain't nobody's business but ours". Their relationship did not allow other people in and in the end it was other people who brought it to crisis and ended it, other people and the intense emotional tensions between the two of them ended it.
The strange but characteristic thing about Ennis' contradictions, is the fact that Ennis knows "There ain't no reins on this one..." meaning he can't deny or control his feelings for Jack but he places reins on the relationship from the beginning and they have to deal with them. Ennis even blames Jack in the end for those limits that cause so much hardship. "It's 'cause of you, Jack, I'm like this..."
Ennis is so pure and so messed in so many ways... but I love him anyway. Like I've admitted... I'm a "Jack at Heart"--- It is remarkable though that they had a love for each other for 20 or more years under those limited conditions.