AFI #013 Ryan O'Neal as Oliver Barrett IV from Love Story (1970)

[last lines]
Oliver Barrett III: Oliver, I want to help.
Oliver Barrett IV: Jenny's dead.
Oliver Barrett III: Oh Oliver, I'm so sorry.
Oliver Barrett IV: Love means never having to say you're sorry.

- Ryan O'Neal as Oliver Barrett IV from Love Story (1970)

The bolded line is ranked #13 in the American Film Institute's list of the top 100 movie quotations in American cinema.