It's wrong to hold a grudge against others.
William is walking down the street when he's approached and greeted by Wendy, his ex-girlfriend from high school who dumped him years ago and who he hasn't seen since.
William wants to respond to Wendy.
William tells Wendy that it's good to see her and asks her about her life and what she's been up to.
William greets Wendy without much enthusiasm, tells her he's really busy and keeps walking.
Wendy is impressed by William's manners and gives him her new phone number so that they can hang out sometime.
Wendy decides that she made the right decision to break up with William when she did.