Can we say that any resentment is justified? The wrongs that people have done might indicate otherwise. Justified resentment only ensures that undesirable results will ensue.
Such results include unhappiness, anger, disappointment, frustration and plenty more. If those things don’t take a physical toll, they eventually will and the results will start to look like fatigue, illness, even cancer. These greater outcomes may be indirectly related.
Healing from anything will not been hanced by resentment it may actually be what limits recovery.
The simplest way to overcome resentment is forgiveness. If that price seems too high, check with the alternative.