I was scrolling through my sm last night looking at some lovely holiday photos of my friend, her DH and their children. And I'm slightly disturbed that my thoughts were "I hope he's not one of the ones who leaves her after misbehaving and their lovely family gets broken up".
Like the OP, I too know plenty of women thats happened to. I also have plenty of single friends in their late thirties, who are attractive, employed and good company for whom meeting a partner has just never happened. They've tried internet dating, with limited success, and now have mostly given up and just live their best lives. They seem to be really happy too and don't waste their time hunting for an elusive man who might, on balance, be quite likely to bring unwanted drama or trouble to their lives.
Equally, I've had friends who have been horribly dumped after their boyfriend of the time has cheated on them and done the whole dramatic thing involved with it, severely disrupting their lives and in some cases their ability to work, and causing them to suffer from clinical depression and/or anxiety related illness.
Then I think of the men in my sports club, at least half of whom have tried to actively cheat on their live in partners/wives and have been pretty sleazy guys while outwardly appearing decent, well adjusted men.
Its pretty depressing. Birth rates are falling, and whenever you read about it, its always written from the perspective that women are "choosing" to have families later in life. I barely know anyone who managed to get a steady boyfriend before 28!
If I were to guess why, I'd say its because men have had life quite easy in the workforce until now, with little competition for jobs from half the population, and many were able to walk into easy jobs for life whereas women really did have to get a husband to be able to have a reasonable standard of living. That hasn't been the case for decades now, and its less the case all the time, but entrenched attitudes die hard and there are still plenty of male dominated sectors with easy well paid jobs for life around, but amongst professional men, many of them seem likely to end up single in old age or with an "internet bride" from a poorer country (I know of 5 men who have married women they barely know from overseas whom they met on the internet). I'm not saying theres anything wrong with that, but it might be one increasing trend that contributes to why European women are having less children.