It is revealed that on the night that Diana was killed, she was planning to tell her father (Dustin Hoffman) that she and Joe (Jake Gyllenhaal) were breaking off the engagement. After her death, Joe falls in love with Bertie (Ellem Pompeo). At the trial for the murder Joe can't lie anymore and confesses that he and Diane were just good friends and that she wouldn't want this trial to be happening and that all that matters is the truth. Ben (Dustin Hoffman) and JoJo (Susan Sarandon) forgive him and tell him that they still care. Joe and Bertie leave the town together and go on a road trip.
Thanks, Sean K and DitaSpavey!