They become so judgmental that each assumes the worst of the other. He said that just to hurt me. That sort of thing. When we fall in love we are at first extremely love-oriented toward the person we intend to marry. Even if family or friends were to point out the idiosyncrasies in our prospective husband or wife, love would cause us to diminish these comments about their shortcomings.
Love is blind.
We become law-oriented in our approach to our spouse when nothing that they do suits us. Sometimes couples become so judgmental of the other that they can no longer even stand the sound of their spouse's voice. It's as if everything about that person irritates them. Suddenly there's nothing about this person that they vowed to love that they like. Now everything reverses.