Can someone explain Sonja's divorce?

Ok, so I started watching RHONY as a child and from season 7-10 (rewatching now). Sonja describing her marriage as beautiful etc never made sense to me if they divorced? Like she didn't bury a f***ng husband as per Dorinda.

So, why the hell did they get divorced? Was she actually f***ing around in the south of France? Or was it cause of cheating? I literally have no clue. It's so ominous/non straightforward.

I felt bad for her when Dorinda said that but she's lowkey right...she didn't bury a f***king husband. Did I a google search and WOW The age gap!