I know your friend’s story all too well - and can state, emphatically, that I’ll neither marry again nor live with another woman nor fully trust any woman. Ever. Collectively, the gender is a rabid wolverine that smells nice and smiles when it wants something - and then rips your throat out when its bored - or thinks her mentally defective gurlfrens are having way more fun than her.
It isn’t that the female sex has changed, that causes the problem.
Social norms, cultural norms of the times don’t keep men and women apart, it is the laws, and the government interference which has changed, and which makes it so risky for men.
This is about law and government, not women as a sex.