“Marriage died because fornication became acceptable enough to be the norm.”
Don’t think quickie, ‘no-fault’ divorce didn’t have a lot to do with it also.
Most people today give getting married about as much thought as they do signing an auto lease. Heck, you can get out of either one of ‘em anytime you want to.
Yes, in this day and age where serial polygamy (successive fornication and marriage and divorce), multiple premarital-sex partners in rapid succession, is common, if not the majority of all intimate relationships, marriage is a fool’s wager, especially for those males who bring more resources to the table.
A woman who has slept with one too many men is bound to be desensitised to the idea of monogamy, unless significant (extraordinary) will power prevails. Men are not as deeply hurt by abandonment as women are, simply due to the biological stakes a woman invests into a sexual relationship, though she may not be fully aware of it. You cannot bypass millions of years of evolution without some hurting happening along the way.