According to the dictionary resentment means: "A feeling of indignant displeasure or persistent ill will at something regarded as a wrong, insult, or injury." The key word in this definition is persistent; when you feel resentment you keep having fantasies about revenge.
Anger means: "A strong feeling of displeasure and usually of antagonism." So what is the difference between resentment and anger?
Whenever you choose to keep your anger and become resentful you lose your joy, you close down. You are not going to feel good about yourself, therefore you are contributing to increase your low self esteem.
I have also noticed that when I get trapped in this circle I put myself again in a victim position, because I am keeping my anger to justify that I am right. The other person is the problem, not me.
Do you still like to be the victim? To be a victim is one of the characteristics of low self esteem. If you keep putting yourself in victim situations by not letting go of the anger and resentment, you will not be able to have a healthy self-esteem.
I have found that the best question to ask at this moment is: "Do I want to be right or happy?" Keeping my resentment will not change what happened, and will not change the other person. It will only increase my self-pity.
It is worth thinking about. If somehow you are able to let go of the anger, you will free yourself from resentment and you will be able to build a healthy self esteem.
"Resentment is like taking a poison and waiting for the other person to die." --Malachy McCourt
"Get mad, then get over it." --Colin Powell