Look at it like an archer walking around with a quiver full of arrows... Aka truth darts, have them on the ready and when you are confronted with that "you're off nekkid with another woman" line you raise your bow calmly, state how you are a man who has integrity and honored his vows and continue to do so... That's it.. One arrow hitting the bullseye and you walk... Do not fire off gunshots about what she is doing nor with whom as its a given and not needed to be brought up.
Short and to the point.. Then you end it and walk ... Let her slow cook it and think about that