Resentment is a burden that a person carries within himself willingly, hoping that one day it will be lighter. But the past won't change because you replay it in your head over and over again.
Learn to let go. Not for those who hurt you, but for you. Do not return your thoughts to betrayal, do not seek justice in endless disputes with the past, and do not waste your life on revenge plans.
Remember: forgiveness does not mean that the action was right, that you have to trust again or let the person into your life. You can forgive and close the door forever.
Don't let other people's cruelty make your heart the source of your pain. Sometimes the best thing you can do for yourself is to stop giving importance to those who once caused you pain.
You don't have to carry into tomorrow what hurt you yesterday. Make room for life within yourself.