Of course, an alternate interpretation might work too, polly.
I think even you would acknowledge that it is possible for one to actually not be bothered by the receipt of divorce paperwork that he knew was coming; to actually have accepted the idea of being divorced; to actually be prepared -- indeed, in many respects eager -- to move on to the next woman (or, preferably, women); and to recognize -- to embrace -- the reality that NOTHING will bring a Walkaway back except Walkaway's own choice and that one has NO POWER WHATSOEVER over Walkaway's choices.
And that it is possible that all of these things are indeed the "lessons" to which you refer.
I look at it this way -- if I considered my spouse to be an enemy or a b*tch or an a**hole for leaving me, why would I want to waste a moment's time or energy pining away for her or him? Every hour, every minute, every second I spend thinking about my enemy is an hour, a minute, a second that I'm closer to the grave. Is that really the best use of my time? Give it a rest, already. Let it go. Embrace the Spiers Doctrine:
"You know why you hid in that ditch, Blithe? You hid in that ditch because you think there's still hope. But Blithe, the only hope you have is to accept the fact that you're already dead. And the sooner you accept that, the sooner you'll be able to function as a soldier should function."
