Can you really forgive if you don’t forget? God doesn’t think so. When He forgives He forgets. Speaking about all those who accept His forgiveness and salvation through faith in Jesus, He says:
12 For I will forgive their wickedness
and will remember their sins no more. (Hebrews 8:12)
So, this woman goes to her priest and says, “I have a word from God for you.” “Oh no,” he replies, “we don’t do that in this church.” She persists and he finally tells her to prove she really is in contact with God. He tells her to ask God to tell her the last sin he owned up to in confession. If she gets it right, he’ll listen to what she has to tell him. When she comes back, the priest asks her what God told her was his last confessed sin. She says, “God said He can’t remember…”
Of course, you could ask all sorts of logical questions about what could be impossible for an all-sovereign deity. But the point is this: once God has forgiven you, that is the end of it. He will never bring it back up and hold it as leverage against you. When you accept Jesus’ payment on the cross as a full payment for all your sin, your account is paid in full. It’s done.