How do I expose the affair

[Puppy Dog Tails]

I'm not in favor of directly confronting OM/OW. I think it elevates their importance, and gives them respect they don't deserve (think POTUS meeting with a leader of a band of rag-tag terrorists), it may cause the betrayed spouse to say things they'd regret, and it tends to elicit a response from the predator that might be mistaken for even one SHRED of truth.

I prefer to see betrayed spouses concentrate their exposure efforts on the OM/OW's spouse, and their confrontation efforts on their own cheating spouse.

Puppy