According to the National Center for Health Statistics, over 2/3 of divorces are filed by women. It became even higher (over 70% ) after no-fault was introduced. And the women initiation rate is lower in States that by law award joint custody of children, as opposed to awarding primary custody to the mother by default. Among college educated women it is 90%!
sam responsible seems to make a good point. I would attribute it to the failed expectations brought by feminism not living up to reality.