The enemy loves to remind you of the past. When he does, he flashes before you images of events that are often remembered by no one but you.
Reflecting the public or private miseries of the past is equal to putting up a sail to catch the winds of defeat. What can possibly be gained? If during prayer, the Lord brings to mind something that should be brought to Him for repentance, that is different.
We are being prepared for Eternity. We are to be forward-looking.
Take the matter to Him, and do it aloud.
Then, look up and move on!