I'm only mentioning this as a potential future divorce topic.

It's not up to debate whether or not I accept cheating because I've already set it as an immovable barrier multiple times: come into sexual contact with anybody else during the marriage and she's going to be thrown out of the window with all of her belongings.

But if she comes to me with honesty and hasn't done anything yet - why would I want to be on bad terms with her as she leaves? I can only be sad at her decision.