Love and the unity bond in marriage requires trust and loyalty for a partnerhip to be everlasting. When love is selfless for your spouse and you can envision eternity with this one person, the possibilities of receiving the ultimate gifts of a lifetime are received.
God created marriage for each person involved in this partnership to grow spiritually as individuals and also together as one. Each supporting the other with fulfilling their calling in the world. Your calling is your special purpose, your gift that God gave you to serve others.
If we are distracted by our spouse's ability to provide trust and loyalty in our partnership, it becomes challenging to give focus to our calling/gift. There is a feeling of being off centered and lost.
Without trust and loyalty, the door is open for division and unity cannot last in this environment.