We all commit mistakes. They are inevitable. We regret some of them. They do not drop off even though we wish they be cast away. Here is a way to get rid of them.
Say this three times. Regret will drop off.
Repeat once every so often if necessary
1. Hey my mind listen.
2. I find that you are holding on to this regret for the mistake committed by me.
3. Please let go of it.
4. I will do all that is necessary in the matter.
5. Thank you.