Based on Ben Affleck's complicated dating history, the actor seemingly has a hard time maintaining romantic relationships. His '90s romance with Gwyneth Paltrow, and why it ultimately ended, clues us into Affleck's apparent boyfriend habits.

As outlined in a new biography about Gwyneth Paltrow, the actress’s sex life with former boyfriend Ben Affleck was apparently hot and heavy—so much so that, according to the book’s author Amy Odell, they couldn’t keep their hands off of one another, even on set.

In her new book Gwyneth: The Biography, Amy Odell writes that Gwyneth Paltrow's friends reportedly thought Ben Affleck was "not a good boyfriend." Affleck and Paltrow were an on-again-off-again couple from 1997 to 2000. Although they did not work out romantically, Paltrow said in a 2015 interview that she is still friends with him.