If there is someone in your life (including yourself) who is trying their best to change, let them repent. Promise them you'll help them bury their sins and mistakes deep by never bringing them up again. When it comes to mind, acknowledge it and then dismiss it. You cannot allow your past (or anyone's past) to hold you hostage. Refuse to allow yesterday to ruin tomorrow. I promise you God cares more about the future than the past. Forgiving yourself and others is the key to real peace and freedom.