Do's
Let your feelings out
Reflect about what you've learned from the situation you are in
Remind yourself of the small things that irritated you about the person
Create a separation between you and the person
Boost your confidence by doing things you like and are good at

Dont's

Don't stalk the person
Don't talk about the person
Don't lower your expectations of the next person
Don't look for revenge
Don't spot the person in a room