I just lurk here, so take this for what it's worth.
My parents divorced when I was 16 and it totally blew me out of the water. This was a LONG time ago, mind you, and NOBODY had divorced parents; maybe now that it's more common it's not such a big deal? No, I know that's not true, but hopefully you know what I mean. I don't know for sure why...they had been married 26 years at that point and I have theories, but it doesn't matter now.
What I DO know is that my dad's selfishness in leaving has permeated our (us kids) relationship with him to this day. Now he is elderly, living alone, having multiple health issues and is really on his own. Many of the health issues are totally of his own making anyway, which doesn't help. Our mom never said a word against him--she knew he would dig himself a really deep hole with us all on his own and he did. She also supported him in almost every way possible before he walked out (believe me, he really pushed it). Why he didn't consider the long-term ramifications of such a decision shows just how clueless WAS's can be.