If you are not aware that God did it, He may not have. If God is working, He will give you the grace both to forgive and forget. If we are forgiving graciously and lovingly, we are being forgiven in this way in the sacrament. This would attract us to Confession. The essence of forgiveness by God's standards is the giving of mercy.
Mercy means to treat others better than they deserve.
When we extend mercy to those who have offended us, we kiss prodigal sons, give presents to offenders, and have special celebrations in honor of our enemies. These people don't deserve this, but we have mercy on them anyway. We don't deserve the redemptive death of God's Son, the shedding of His blood, and the promise of eternal happiness. But He has given them to us anyway because of His mercy. The Lord expects us to pass on to others the merciful forgiveness we have received from Him.