He is not on the hook to her at all.
He is responsible for his children, whom I’m sure he is happy to raise as well as provide for.
He is not responsible for her, because she is an adult who needs to be responsible for herself
That is why there should be no alimony.
No ex-husband should pay the bills incurred by an ex-wife.
Her family just came into a financial windfall. They may have told her to dump Don before she gets her share: