India, Oct. 14 -- Following Diane Keaton's death on October 1l, a source has revealed that her ex-partner, actor Al Pacino "regrets" not marrying her. Diane, who died in California, US at 79, played Al's on-screen partner in The Godfather trilogy; their real-life on-off relationship began in 1974, eventually spanning over two decades. The actor-couple finally split in 1990 after Diane reportedly gave Al an ultimatum regarding marriage, that he turned down. One of Al's friends reportedly told The Daily Mail: "I know he will forever regret he didn't make his move when he had the chance. For years after he and Diane split, Al used to say, 'If it's meant to be, it's never too late for a do-over.' But sadly, now it is." "Looking back, Al admits the love of his life was Diane, who he's always called, 'an amazing woman,'" the friend added. Interestingly, the source revealed that while Al (now 85) and Diane lived near each other in California's Beverly Hills, they did not stay in contact after their relationship ended. "I once asked him why, and he told me, 'There's no need to talk with each other. We said everything that needed to be said at the time,'" the source said.htc...