Do find yourself digging your heels into the ground and holding grudges when really it would be much easier to forgive? Check out this article from LesserEvil Life, there is science behind forgiveness:
The words, “I can never forgive you,” may be more damaging to your health than to your relationships. A study performed at Mayo Clinic showed the negative effects of holding a grudge on the cardiovascular system, reporting elevated blood pressure and heart rates in those who can’t let go. Reports also showed an increase in muscular tension and the feeling of being out of control.
Forgiveness can also have positive effects on your mental well-being. Research shows that helps reduce grief, depression, anxiety, as well as anger. Being hurt and angry are normal reactions toward offensive acts such as betrayal and abuse.
Things turn unhealthy when you are unable to acknowledge the anger and process the events that occurred. Forgiveness doesn’t have to mean you condone the offensive behavior or that you excuse what happens. It simply means that you acknowledge the hurt and let it go.