13. Robert Pattinson and Kristen Stewart (2008-2012)
Lesson: Puppy love never ends well
Robert Pattinson and Kristen Stewart met on set for their terrible film Twilight in 2008, in which they played the romantic leads who remained involved for four more feature films. But in 2012, Stewart was caught in an affair with her Snow White and the Huntsman director Rupert Sanders, ending her and Pattinson’s four-year relationship despite a public apology to Pattinson. Pattinson did not confirm their breakup until 2014.
