Most Helpful Guy
For a lot of reasons. Stats say that women initiate divorce 70%of the time. But you can't completely fault them for that because better than half the time the guy has quit being a real man, a leader in his marriage. Guys will tend to just hang in there hoping it will get better. They are not likely to give up if things are bad. Women OTOH get to a point where they can't take it anymore and bail.
Both parties get lazy. They get fat. Don't pay attention to the other, sex goes away. Women can and will just shut down sexually. And the guy bitches and whines because she won't have sex anymore. Then some attractive guy comes along and pays attention to her so she bails or has an affair. Or the guy does if he maintains himself.
Bottomline is the burden of performance remains on the man. He must maintain his physique, and his desirability. If he does the woman will tend to stay engaged. If he slacks off she gets bored, or worse begins to loathe him.
People tend to treat strangers better than their spouse. People tend to quit being gracious, and generous. Women will weaponize sex - withhold to control him
There's a start sonny. :)
Most Helpful Girl
Happy marriages don't.
People don't air their problems, especially these days. We put everything on social media presenting these amazing filtered lives, and when people ask how we are it's always "good thanks".
That doesn't mean there aren't problems between a couple, it's just kept quiet until they decide to end it