Oof. The nature of this woman comes out.
I was witness to a very nasty divorce of someone close to me, (so I knew a lot of the details on both sides,) The couple was married for ~15 years, one of them lived very frugally, a career in non profit, helping broken homes, talked a lot about not having a lot of stuff, etc etc. A lot of people admired this person as a “good person” that we should all emulate.
Then during the divorce, bam, true colors came out, and went for every possible cent the person could. Got as nasty as they could. The further into the divorce proceedings the worse the person got. Going from a celebrated non profit worker that talked about the evils of money, to someone that did everything they could to be nasty, if anything to just hurt the person they were divorcing.
Then a few months after the divorce, went and married someone half their age. Pretty much doing everything the person said for 15+ years I knew the person, said that they despised in other people.
Point is; sometimes wow, people get nasty in a divorce, especially once they realize it is truly happening. In my life, I have seen several examples of generally nice/good people that I knew for a substantial amount of time, be vicious and cruel as the can be towards the person that would dare “actually” divorce them. Their true colors come out when things are not going their way.
I imagine you already knew this, but incase you do not, it may be a tiny bit helpful to know, statistically, a couple that that started off both cheating on their spouses, like what your ex is doing, have VERY low rates of long happy marriages/relationship. And very high rates of terrible relationships/marriages that are short lived once the euphoria/excitement inevitably wanes.
And that only makes lots of sense, how can you ever trust the partner that cheated in their last relationship and jumped ship soon as they saw the opportunity? How can you ever trust your partner that cleaned out the last person of money and did not respect the promise of marriage/dedicated relationship? Their word means nothing.
The new relationship is most likely doomed before it even started. Your ex is most likely only headed for more pain and hardship, never finding that true trusting satisfying partner in life that they know they can trust with everything.
Unless your ex is a total narcissist or something similar, she has to live with herself, going to bed at night, and trying to fall asleep to the idea that they deeply hurt the person that provided everything for them and loved them for 20 years.
People are great at trying to rationalize away these things, but the core of what they did will get increasingly difficult to rationalize away, and may be forced to question to themselves at one point “am I a good person?” And the answer comes back as no. And when they realize they cannot even trust themselves to be a good person to those that provide the most for them. Ouch, I do not know of a more lonely lot in life when you can not be even be comfortable with yourself based on your past actions.