That may be the case - and here new ex should have known better - BUT - she certainly should not have received one red cent - the divorce, as far as I read - was 100% her fault, because of her infidelity.
Stupid, just stupid.
She got what she would have got (more or less) whether she was faithful or not.
If he had cheated on her, I don't think he should have lost every dime he owned. Just divide the marital property and each party can move on.