The main quality of a hero is courage – not a reckless bravado, full of impulse and ambition. But a quiet, introspective courage.
In that quietness, the hero is able to discern and then decide on a particular course of action. He might see that it is better to let go of another person’s past rather than hold it against them or constantly remind them of it.
With humility and courage the past is forgiven; the hero completely lets go. Only heroes can do such things.