funny Ive been playing this out in my head also... how the f do you bring this up and what if ole Mick is wrong?
Simple. If you're right, you send OP a screenshot of the info and then he sticks it in her mailbox for her to see. Or like, nails it to her door. Doesn't matter how.
Then when she calls OP crying over the devastating evidence of her BF's unfaithfulness, he says something along the lines of "I always had a bad feeling about that fella."
If we're wrong, OP gets a heartfelt apology, and we all laugh about this silly situation years down the road.