2 Samuel 11-12:
David does something that should have never happened. He was in a place he should ahve never been. Matter of fact he should have been at war. It was spring time and everyone else was gone.
Do you see over a year later how broken david was. The things that happened brought him to a spot where everyone of use needs to be with God. He was so miserable up until he became broken, hince Psalms 51.
The question you have to ask yourself, does God let you remeber your sin. Answer, yes. I know it says as far as the east is from the west, but that's you being forgiven, not you forgetting. Remeber David was broken after a year later. He lets you remember so you don't do it again.