I’ve posted about this before but I’m having a wobble.
There is a huge backstory but I’m going to keep this simple.
If you were unfaithful multiple times at the beginning of a relationship (and were supposed to be exclusive), subsequently married that person and they had later told you they weren’t interested in anything that went on before you made your vows on your wedding day, would you tell them?
YABU - I would still tell them the truth
YANBU - I wouldn’t tell them since they said they aren’t interested.