"You must bear with one another and, if anyone has a complaint against someone else, you must forgive each other."

- Colossians 3:13

Bitterness and anger against another will only cause "dis-ease" within the body. It is not healthy. Besides the "consciousness" aspect of not harboring ill-will towards another, your health depends on forgiving those that have done you wrong. You don't need to "forget" but definitely forgive.