Primary catalyst is woman going into panic mode because their youth is fading. They go to college to relive that youth. For some that panic becomes chronic and they spin off into a whirlwind of crazy.
I know someone this happened to. Seemingly fine marriage. One kid, two luxury homes, a pile of new cars, top end vacations...the fucking works. He is hard worker, fit, no drinking no drugs. Spends a lot of time with kid; she's been raised very well.
Well, youth fading panic set in and that was that. Divorced, back at college. Out every night fucking every young guy she met. Even weirder is she told him to keep his money. He sold the two custom houses, sold her cars.
Fast forward to last year or so, her kid didn't want to see her any more. A life that most women would kill for thrown away so she could bang young guys. That is a really neat trick. And of course when her youth does fade, she'll have no money, no kid, no ex, no houses, no fucking anything at all.
If you are going to fuck up, might as well make it epic.