You cannot negotiate with yesterday once today becomes tomorrow.

Once a day has passed it is fixed, and nothing about it is available for revision no matter how much attention you give it. Reviewing what you should have said or done can look like responsibility while functioning as a way of avoiding today. The past is closed to negotiation. Only the current day accepts input.

When you catch yourself relitigating something, extract the one thing you would do differently and act on it now. Then close the file. If an amends is owed, make it, since that is action rather than replay.