XH left for OW but she dumped him a few months in. Turns out that chasing an NPD/borderline alcoholic love addict wasn't such a good idea! 
But a few weeks later XH met a woman who, by all accounts, is gorgeous, happy, kind, successful, comes from a great family, athletic, huge social circle and they now have 3 beautiful kids. He has always had that kind of luck, "failing up" as my father says. To say it took a huge toll on my self esteem is an understatement as in the back of my mind I hoped that XH would either end up with a dumpy crazy woman or that he'd come begging for my forgiveness. They were having their first child around the time my first post-D relationship was ending and I was truly suicidal for the only time in my life so far.
All I can say is that it gets better. I check in on them a few times a year on social media and I've noted a few cracks in the facade that I get some pleasure from, but overall they seem pretty happy. Sometimes the karma bus comes, but not always.... I now wish for good things to happen for me rather than bad things happening for him.
Here's a comfort story: my aunt's husband cheated on her and left her for OW. Aunt was devastated. A few years later OW shot him dead while he was taking a dump because she caught him cheating. She's still serving her sentence.
