It's noble to apologize and make up for past misdeeds.
John just started a new job and on his first day he runs into Paul a guy he bullied in high school.
John wants a fresh start with Paul.
John apologizes for his past behavior and asks for Paul's forgiveness.
John pretends he doesn't remember Paul and introduces himself as a stranger.
Paul is able to let go of his lingering hostility allowing an adult friendship to form.
Paul is resentful that his childhood tormentor doesn't remember him.