Love calls for loyalty. Those who divorce betray this sacred commitment of love, demonstrating, instead, unfaithfulness and treachery. The impact of Malachi 2, however, is not primarily broken marriage vows, but Israel's broken covenant with God. In graphic language, God demonstrated that covenant breakers with men become covenant breakers with God. Where the spirit of treachery is in human relationships, in other words, it will be in one's relationship with God.
Divorce demonstrates hardness of heart.
To this could be added the witness of many marriage counselors. The underlying problem in marital conflict is self-centeredness. Divorce is but the continued expression of a hard heart. It takes humility, love, and brokenness to resolve marriage problems and to experience the oneness intended in marriage. Divorce hurts one's partner.