It's tempting to get revenge against someone who crossed you. Before doing anything rash, take some deep breaths. Think about how your actions will affect your reputation. You may think you can get away with a nasty gesture, but you're wrong. Don't do anything you will regret. Channel your anger into physical exercise. Even taking a long walk can clear your head. It's understandable you feel angry and betrayed. Giving in to this hate will make a bad situation worse.