It Only Took Me 20 Years

Found out that my ex-husband is leaving his 3rd wife for someone else. I mentioned in a previous post that he left me when I was 2 months pregnant. Well, he left me for someone who had a child that was about 1 year older. Now, he has two other kids. I would guess that they are 15 and 13. He has left his current wife for " and old woman with her teenage daughter" as she was described to me. What is his problem?
It only took 21 years, but finally I know, IT WASN'T ME!