Her ex said thought he wouldn't get caught either. Eventually, she's gonna get busted and feel so ashamed of herself. I don't think she's really thinking of how bad this will be for her personally. His wife will probably go scorched earth, and from other similar situations I've seen in the past, will make it her life's mission to destroy your friend. It's one thing when the other woman didn't know he's married. It's a whole other thing when she does. She's risking her career, personal reputation, and very possibly, her families respect for some scandal d*ck. She's clearly lost her mind and needs to get in therapy today!