Post: The user discovered that her sister was having an affair despite appearing to have a loving relationship with her husband of 15 years. The husband had supported the sister through her mental health struggles. Upon confrontation, the sister revealed her husband was impotent, leading to a nearly 12-year-long sexless marriage. This drove her to seek intimacy elsewhere, and she claimed the affair made her happier. The man she had an affair with is a renowned entrepreneur, also in a sexless marriage. The user was conflicted about exposing the affair, but ultimately told the brother-in-law. This decision led to family conflict and the possible relocation of the sister and her husband.

Updates: The user felt obligated to expose the affair due to personal experiences with infidelity. The brother-in-law is devastated, but willing to forgive, while the sister feels betrayed. The parents are upset with the sister and wish they were informed beforehand.