Dear Jackster - yeah, the common understanding of a marriage is a public pronouncement, and a divorce, the same. Am afraid I've been influenced by a little-known fact about my own denomination's (R.C.) teachings, which are that the marriage actually is effected by the 2 people, and the priest is only a witness. Dumping the church's other elaborations, then, I am left with a primitive definition of marriage as 2 people saying: it's you and me, and no other.
Did Ennis and/or Jack reach that level of commitment on the mountain? Emotionally, I think they did. Jack and the shirts. Ennis and his brooding on the hill. But the territory being so unfamiliar, they had no rational understanding of what had happened. In that sense, then, Aintfoolin's "marriage of the hearts" had occurred, and they spent all the following years catching up to it, or trying to. In the broadest sense then, both from a romantic point of view, and even incorporating some element of formalistic dogma (the union is effected by the individuals), it's arguable- them dudes wuz married: it's you and me and nobody else. And that prior commitment may have doomed their formalistic, ritual marriages to their wives.
Matt-your heart is in the right place. Baby Tammy, you are right - if there was a marriage, no divorce occurred. I don't need any aspirins, as it turns out....just several 6-packs and a re-viewing of the DVD and a toast to Jackster: here's lookin at you, kid (from Casablanca, or did I screw that one up too?).