One thing I do feel sure about, and that is that we can't judge why other people 'throw in the towel'. I agree, crimson, that sometimes failing sleb marriages look like as if they're just throwing in the towel because all is not sweetness and light in spite of their money (so money doesn't cure anything either), but we cannot know. It took me many years to decide that I might as well leave my first husband because, to all intents and purposes, I didn't feel married to him any more! This was without unfaithfulness on either side, and we parted as amicably as possible and, after the legal stresses were over, without any hard feelings either way. Nobody, but nobody else, can know how I felt and why I acted as I did. And, as far as I'm concerned, I didn't break any vows. They had dissolved of their own accord.
I guess I'm arguing that it's daft to make divorce a news item. People 'combine' (marry), sometimes (often, even) they grow apart. So what? Human nature. Just get on with it is my view. Obviously the less hassle for children the better. Otherwise... well.... shrug. Reporting it as if it was newsworthy strikes me as a bit judgmental.
Anyway, I've wandered away from the "exasperated" relationships. Or have I?
Sorry. Rambling.