What can you possibly gain?

Reasonable people disagree on this forum about things like exposure, snooping, continuing to have sex with a wayward spouse, etc. But I've yet to see ANYONE disagree (nor any book or other expert) about this:

DO NOT CONFRONT THE OTHER MAN/OTHER WOMAN.

It only elevates them in importance, it makes YOU appear weak, and you may not be able to control yourself (you seem very anxious to me?). I could give you six other reasons.

You asked for advice, and I've given it. What you do with it is up to you.

Puppy