I'll put my two cents' worth in.
I tend to believe that both Jack and Ennis loved their wives, in some sense of the word, though their relationships were troubled for obvious reasons.
More specifically: Jack is generally nice to Lureen. If the "you call the school about the tutor" scene is any indication, their fights were pretty mild. (Lureen also is pretty easy on Jack.. "why doesn't Ennis ever come down here?") And the whole Thanksgiving fight with LD was about Bobby respecting his mother.
One important point: The question of whether to remain married is completely in Jack's hands. He told Ennis that LD would pay him to get lost, and Jack was interested in the offer but did not take him up on it because of Ennis' issues. On the other hand, Jack drives to Wyoming when he hears about Ennis's divorce, apparently ready to leave Lureen right there, possibly without regard for any financial settlement. So it was
Jack who stayed with Lureen all those years. It seems Lureen was more interested in the "family business" aspect of the marriage, which was going fine.
And I think,
tpe, your intitial assumptions are still valid. Of course couples with children divorce, but I don't see Lureen as very excited about parenting, so she appreciated Jack taking the lead there--even (in the scene driving the tractor) "training" Bobby in the business.
And appearances.... Once again, a "rural" (though Childress is not a tiny town), conservative milieu in 1970's/1980's Texas was different from living on one of the coasts or in a big city. Much of the social scene in such a place would be related to church activities (as in Riverton) and divorce could really be kind of scarlet letter, especially for women. I grew up in a rural area, and of course there were some divorced people around, but not that many, and there definitely was a stigma. I remember when a divorced mother of one moved into town and started a job as a schoolteacher. There was quite a bit of gossip and some shunning of her.
That's it for now.
