Do yourself a favor: forgive someone.
Recent research suggests that people who let go of a grudge may experience less pain, anger, anxiety, and depression and may be more content than people who are unable to forgive. So mend some fences and don't let lingering resentment harm your health.
Anger, resentment, hostility, and vengeance can harm your physical and mental health and may even influence your risk of chronic health conditions, such as heart disease.