To let go seldom means to let go of the incidence itself. There is never the joy of forgetting it all, but only the efforts of consciously nurturing healthier responses to the myriad pieces of memory for the rest of your life.
To let go signifies the acceptance that comes with learning to let go of this incessant urge to have a say in how things turn out to be, this crazy need to have some sort of power in changing the situation.
To let go is to show yourself grace for wanting the best in every situation, and yet to make peace with how it is.
To let it go is often to simply let it be.