The best way to move on is to "move on". When your thoughts turn to yesterdays, make a u-turn and get back in today. When resentments fill your heart, use the antidote forgiveness and let the pain go.
If we learn from the past it no longer becomes one big mistake, it becomes the lesson that will help us do better next time.
Good luck, you deserve happiness in your life and you alone hold the key.
Hugs