Tough one I know..
Would you want to know re. An affair?
The partner has cheated multiple times, the person has been with the person who cheated for most of their life (late teens-late 30s), they have 3 children, debt, mortgage, holidays, busy lives, memories.. together.
Or will they just be blissfully ignorant trying to get through in their own way?
I have been burnt in telling someone about an affair (I was not part of the affair, I feel i must add) before so wouldn’t go there again in telling someone personally.