God created the marriage covenant, thus, God honors marriage. God hates divorce. There is no adultery exception to divorce. Anyone who divorces his wife causes her to become an adulteress. A hardened heart can be softened by the power of the Holy Spirit. You cannot make a good decision with a hardened heart. The sin of adultery/divorce and the resulting condemnation can only be forgiven by the blood of Jesus Christ who died for the sins of the world.