Al Pacino reportedly regrets not marrying Diane Keaton after the actress died at 79, ending their chance for reconciliation following their nearly 20-year relationship.

Godfather' co-star and partner "brought me happiness and on more than one occasion influenced the direction of my life."

Al Pacino, who played Diane Keaton’s fictional husband in The Godfather trilogy and who also dated the actress in real life, shared a powerful tribute to Keaton following her death on Saturday at the age of 79.

Al Pacino and Diane Keaton had an intense 15-year on-again, off-again affair until they broke things off in 1990 — but a source tells National Enquirer that the Scarface star never stopped loving her and now,

Diane never married but is survived by her two children. Here, we’re looking back at the late actress’ dating history.