Well first of all, these comments are all very heavily laced in judgment of his decision to leave OP and be with someone else. I don't believe that's appropriate or relevant
Because some "woman scorned" want their maintenance no matter how detrimental it is to the children involved. You only have to see the support for OP hypothetically being a millionaire, how she should absolutely claim her £4 of flesh so the twins see neither parent and their household suffers, even if she wouldn't even notice the money.
Because some women can't bear that someone had the audacity to leave them. They will talk of "the other woman" because how much better it sits with them to look like the poor defenceless wife whose husband was snatched, rather than admit their husband just couldn't bear to stay with them anymore.
You'll note here, OP and EXh divorced in 2017. Four years ago. Posssibly five when you consider they would have separated first, then had to go through all the divorce.
He's got 1yr old twins. They were born in 2020. Three/four years after he was anything to do with OP. We've got no reason to disbelieve OP saying "he left me for her" so we have to take that at face value. But combined with the fact she doesn't like the idea of pulling her own weight and getting a job five years on, and is looking for his new wife to simply hand her money, I would question whether she falls into the category of many who claim they were left for another woman, when they were in fact just left.
The EXh has worked, and paid her maintenance since the divorce. And had the children 25% of the time. Up until now, where presumably the mother has returned to full time work and he has to remain at home to negate the massive twin childcare bill they would have, as a result of unexpected twins, and not claiming benefits that would give them a massive subsidy.
5 years on she's still making excuses not to get a job when she has no childcare costs, and looking for a woman who is nothing to do with the financial responsibility for her children, but already pays 25% of their upbringing, to pay her extra while she sits at home for another year, "preferring" not to be better off by getting a job.
And seriously, people are in disbelief at how some ExW's are possibly seen as grabby and lazy?
Christ. On. A. Bike.