Augustine of Hippo
You may find it harsh to reinstate a wife to her husband after she has engaged in infidelity, yet where there is faith, harshness is absent. Why do we label as unfaithful those whom we believe have been purified through baptism or restored by repentance? According to the ancient law of God, no offering could redeem the sin of adultery, a transgression that is cleansed solely by the blood of the New Covenant. Thus, in the times of the Old Testament, it was prohibited to remarry a woman who had been sullied by an affair with another man. However, David, as a precursor of the New Covenant, did not hesitate to take back into marriage Michal, the daughter of Saul, who had originally been given to Phaltiel, son of Laish of Gallim (See 1 Samuel 25:44), after she had been separated from David.
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In our current era, Christ addresses those who have sinned in this manner, saying, "Neither do I condemn thee; go and sin no more" (See John 8:11). It is clear that it is the responsibility of the spouse to extend forgiveness for a sin that the Lord Himself has pardoned, and that one should not label as an adulteress someone whose sin has been removed by God’s grace through her repentance.