You shouldn't try to sabotage someone's relationship.
Jane is upset at her friend Mary for not inviting her to a ski trip and notices Mary's boyfriend eating dinner alone at a restaurant.
Jane wants to consider spreading a harmful rumor involving Mary's boyfriend.
Jane decides to not spread any rumors at all and just forget about the ski trip.
Jane spreads a rumor about Mary's boyfriend eating dinner with another girl.
Mary invites Jane to the next ski trip, and they have a great time.
Mary traces the rumor back to Jane and is no longer friends with Jane.