Need 'How to' on exposure,,,, and balls to do it

[Optimust]

I'm also curious to what my reaction should be if she denies the A, and demands proof?
Do I just say,"we both know you are having an affair" or "You were here with him yesterday, and here with him the day before, and you spent the night at his house multiple times, on the nights you didnt come home"
I do have photographic proof and eyewitness proof, and phone log proof, it's just everyone says "DONT SHOW YOUR SOURCES", I'm sure as to not show your hand so they can avoid the same pitfalls in the future, or fly into the 'invasion of privacy' discussion. The last one holds no water with me, because the A is 100 times worse.
Juat looking for lots of input at this juncture.