Beloved Hollywood leading lady Diane Keaton died with a broken heart after never realizing her dream of walking down the aisle with the love of her life – her Godfather costar Al Pacino .

RadarOnline.com can reveal the failure of their longtime romance soured her on men for the rest of her life and that she was consumed with regret about what might have been with 85-year-old Pacino before her October 11 death at 79 .

The pair was on again, off again for over 15 years before Keaton gave Pacino a marriage ultimatum in 1990 – and he headed for the hills. Article continues below advertisement

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"It's sad that Al lived just down

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