The past

As much as you wanna forget things from the past, you can't just really run away from it. At some point you will forget about something from the past but there will be always this one thing that will trigger that bad memory to give you flashbacks, it will be hard, especially if it's about the things that you have your most regrets. So just like what that monkey said from lion king. Learn from your past, don't let it bring you down man. Learn from it and use it for the future.