Al Pacino's biggest regret was never marrying Diane Keaton, according to the Daily Mail.
The two actors played a married couple in Francis Ford Coppola's Godfather trilogy and had an on-and-off affair from 1971 to 1987.
“I know he will forever regret he didn’t make his move when he had the chance,”
a source told the Daily Mail. Al Pacino reportedly calls Diane Keaton "an amazing woman" and considers her the love of his life.
Author's summary: Al Pacino regrets not marrying Diane Keaton.