There is no hiding the fact that sin had been committed. Although Abimelech had not "approached" Sarah, there had been deception, and a dangerous path was afoot. And everyone had excuses for his behavior. Nevertheless Abimelech did what he could to rectify the situation. He returned Sarah to Abraham, and provided gifts meant to show his and Sarah's innocence.
On some level you'd have to say that Abimelech made it right. And God healed Abimelech and his wife and the women of his household. Because Abraham prayed for him, much had been and subsequently was set aright.
This is the goodness, righteousness, faithfulness, justice and mercy of God. And although we may not need to be in a 12 Step program, we all have hurts and addictions small and great that need God's touch of grace and healing. You may need to start with step 1, grapple with steps 4 and 5 (cuarto y quinto), help someone in the same manner you have been helped, or somewhere in between. There is a path to walk with God and he will be with you every step of the way.