Looking for stories where there is a significant age gap and, if younger woman, they cheat on the older husband and divorce ensues. If younger man then the older woman dies and the young widower has to try and move on.
Not looking for swinging or sharing, more interested in jealousy and betrayal.
I don't know that there are any stories like the two ideas I am looking for as most may/december stories are "happily ever after" stories.