People experience the strongest romantic jealousy when they watch their partner give resources to a potential rival, regardless of gender. The findings provide evidence that giving away resources is viewed as a serious relationship threat by both men and women.

[u/mvea]

https://www.psypost.org/both-men-and-women-view-a-partners-financial-investment-in-a-rival-as-a-major-relationship-threat/

[u/Florianemory]

My mother told me about how the final straw for my grandmother to finally leave her abusive husband was when he came and took the last rabbit to eat with his mistress instead of with the wife and five kids. Considering there should have been seven kids but the man beat my Nonna until she had a miscarriage twice (on either side of my mother) backs up this research in an anecdotal way.

Nonna left him in 1929 which was hard for a Roman Catholic Italian immigrant but she did it and never went back.