I wouldn’t. If my ex-partner decided to have an affair without thinking of the consequences, I’m not obligated to do it in their stead. I’d be covering for their fuck up and become a welcome mat.
Having said that, I’m a product of divorce and I knew from a very young age who fucked up and why. If my parent had told me at that age why I wouldn’t go, I would’ve understood. But then again, I’m not your kid.
That for all intents and purposes, I beat depression. And here’s me knocking on wood to not jinx that.