The only thing we can do about a ‘bad’ past is to choose a new relationship with it. Having the same relationship with our past, HERE & NOW, is as good as being in the past with all its baggage. Since our future is determined by what we do in the present, being in the past, presently, will produce the same result as in the past & current present which means being stuck in the same loop; producing the same result; being stuck in the loop.
Therefore, the only way to create something new is to let go of the past and break the loop of our past-present.