This happens a lot more frequently than people think. Especially when a woman realizes that she made the wrong choice in life. And they are 'detached' from the marriage.
One I had sex with. Only because we separated our relationship on good terms and still remained friends.
The second woman I wasn't going to give the time or day. Because she wanted to settle down with a white guy, instead of me (latino). When my sister found out, she was steaming mad. And she tells my (now ex), you dumped my brother to go out with that fat ugly fuck. You have no idea how good you had it.
Fast forward, my now partner and I pulled up in the parking lot. We noticed this guy berating some woman in the parking lot. A little closer look...it was my ex. I let my partner know and she tells with, with incredulity, she dumped you for THAT?
We go in the store and my ex approaches us with a look of complete distress and tells me...I made a huge mistake. Which was certainly an understatement. They had later divorced, and I wanted to have nothing to do with her.
So it shows you how, that you should leave a relationship on the best possible terms. You just never know....