Maybe because now they no longer need men for reproduction, the paycheck, or the protection.
We have test tube babies if we want children, our own careers, and a gun if we need it.
Maybe they are tired of being treated like a maid, sperm collector, and 2nd rate to men.
If men would put the energy into the getting and keeping a woman through REAL love instead of half assing it then this may not happen to all.
I know it can be a two way street and woman need to try also but to me(I am bisexual and still married to my husband)it seems that if men spent less time looking at other women and more at looking at their own then we may not be so quick to look elsewhere.