How does the confession and repentance look? Is there some duty to make restitution or is it simply between you and God?
I am curious because I've met plenty of unrepentant repentants, if you follow my drift.
Confession and repentance is between you and God (or someone else and God).
However: “So if you are offering your gift at the altar and there remember that your brother has something against you, leave your gift there before the altar and go. First be reconciled to your brother, and then come and offer your gift.” — Matt 5
So if someone has a just grudge against you, and you want to go to God, Jesus says to first be reconciled to the person. That isn’t always possible - we cannot always identify who we have hurt, and that person may not be available or may refuse reconciliation - but we need to make the attempt.
If WE are the ones with a grudge, our job is to forgive.
If we haven’t tried to be reconciled, will God forgive us? I don’t know of any scripture, but in my own life, I’d say the answer is yes - but he will also make me miserable until I make the attempt.
If that doesn’t help, perhaps someone else can give a clearer answer.