My ex is still married to the same person. We were both supposed to seek divorces from our then respective spouses. I followed through. My ex did not. He dumped me in an incredibly cruel fashion and returned to a life that he never really left.
Ex will celebrate 29 years of "wedded bliss" this coming December. I have strong suspicions that his spouse also has a personality disorder of some kind. They definitely deserve each other. Can you say "domestic violence"?
Painful lessons learned - but I'm better for the experience. The ex is not.