Whlle a lot of what you post is true there is a reason.
"Back in the day" women had few, if any choices, they got married and the man was the bread winner, the idea of divorce for women meant the fear of "what to do now" because they did not have jobs (or not good paying ones) or education past high school.
Men have always cheated and so have women, that is nothing new. What is new (or newer) is that now women have choices, since about the 1970's or so. Imagine how many woman stayed married because they had no choice.
Men have always cheated and really woman cheat too. Studies and take this with a grain of salt, show that men cheat about 7% more than women BUT who knows what that really even means.
Divorce became common because people have choices now.