I had experience that when I did not forgive someone, it took more energy out of me to manage my interactions with her: conversations, behaviors, and emotions…
The truth is that when we don’t forgive anyone, the person takes a space in us. The longer we hang on the matter, the bigger space the matter takes, the heavier the matter becomes… Then we are trapped.
To release us from the trap, we need to let the nod go, to forgive others.
We need to be empathetic towards others. We need to give them space to grow. Or simply we need to allow them making their way of living.
Forgive others, release your energy to do something good, for better.