Primarily because the matriarchy has reworked marriage into a system that financially rapes and enslaves men in divorce. Even if the wife cuckolds the man and he discovers he is paying to raise the children of other men, the state requires him to continue to do so. The state is complicit in adultery.I'd like to know this too, if you are now against marriage because of your experience, why would it be different for your sons, as opposed to your daughters?
Furthermore, women no longer require a marriage offer to put out. Marriage originated as a contract where the woman provides exclusive, frequent sexual access to the man and the man provides protection, food, and shelter to the woman. In today's world, most women freely offer sex to any guy who lifts weights or plays guitar and has the slightest clue about game (a small number of guys to be sure).
All of this is a strong disincentive for young men, at least those who are paying attention, to not get married.