I think this situation demonstrates how money, even when it is in plentiful supply, often has the potential to damage relationships.
OP took the decision to marry someone, entering into a serious commitment to say that from then on they should be considered as a legally recognised family, that they were now each other’s first next of kin etc. They cemented that by having a child together.
A little later on the OP receives a wholly unearned and unexpected windfall and those consequences of marriage she accepted, the sharing of assets, suddenly feels a bit too generous to her.
Faced with the prospect of possibly not keeping 100% of that windfall all to herself if they split, she’s stopped thinking about “us” and “ours” and started thinking about “me” and “mine”.
if they split, she’d still be in a better position having received the windfall than she would have been if she never got it, but it’s now nagging at her that that wouldnt be enough, that it should all be just hers in spite of what being married to someone means.
She’s now looking for ways to undo some of those legal implications of being married. Just receiving the money has started to create cracks in the marriage that wasn’t there before.
It makes you realise why marriage can be so complicated for people who are incredibly wealthy, as the dominant thought in their mind will almost always be ensuring that the wealth stays with them rather than focusing on the marriage itself.
That whole world of pre-nups, trusts, of passing on your legacy to make sure your blood descendants stay as wealthy as possible all starts to seem quite grim. I think people should probably remember this when they dream about that big lottery win, or insist that more money would make them happy. It brings problems too.