You let go of the resentment because it only hurts you. You let it go because resentment, anger, jealousy etc... is YOUR baggage and to be healthy and healed means you have to work through it and learn to let it go.
But people heal at different rates, and then there are some people that never heal. They just carry that baggage and all the anger, resentment and hurt the rest of their lives.
We probably all can think of someone like that.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712