I've probably posted this before on one of the threads, but I really don't understand why he feels the need to "get one over" on OP. He got what he wanted, surely he should be so focused on his great new life/woman/whatever he is doing that OP should not even be on his radar? Any decent man would feel some guilt about his having blown up the family, but he seems to view this as some sort of war. The nickname There We Are Then is starting to feel insufficient now.
Having been on the receiving end of something similar I understand why my ex and many others who end a marriage take no responsibility, & need to blame the person they left.
You would think the leaver would accept that it was their decision and take responsibility, but that’s just not how it works.
Blaming the wife is a way of not having to acknowledge the selfishness of what they did. If you rewrite the story: I didn’t abandon my family; “ I had no choice because I was soooo unhappy - poor me” or “She was so controlling” etc etc.
That false narrative is much easier to live with. The reality is the leaver was unhappy in their own skin, wanted to lead a single life, reinvent himself, find a younger model, be free of responsibility… but admitting those uncomfortable facts, that you therefore chose to blow up your family, is too hard to admit. If you admit fault that means living with guilt and shame. So it’s better to keep finding faults and resentment as a justification.
What you want is them to just say, “I chose this, and I accept responsibility for it.” But blaming the abandoned partner is always easier than facing yourself.