3. Kristen Stewart, Robert Pattinson & Rupert Sanders
Kristen Stewart and Robert Pattinson’s Twilight romance was beloved by millions until Kristen was caught cheating with Rupert Sanders, the married director of Snow White and the Huntsman. The photos leaked online, causing a media frenzy.
Kristen apologized publicly, and while Robert tried to forgive her, their relationship eventually ended. This triangle remains a cautionary tale in celebrity relationships.