In order for us to move on with our lives, we have to learn to let go of what bad events happened in the yesterday because we'll get stuck on working what should've been instead focusing what to do in the present. If we let go of things that happened in the past and even the heaviest ones especially if it means a lot to us. So it may be hard to let anything go but unfortunately we need to in order for us grow and change. Some bad events aren't worth holding on to or bad actions because of those events aren't worth either.