Trust is a very important factor for all relationships especially for married couples. When trust is broken, it is the end of the relationship. Lack of trust leads to suspicion, suspicion generates anger, anger causes enmity and enmity may result in separation.
One day a taxi operator received a phone call. She answered, "Holiday Taxi" There was silence. She repeated, "Holiday Taxi" There was still no answer. When she was going to cut off the line, she heard a lady's voice, "Oh, so this is Holiday Taxi. Sorry, I got the number from my Husband's pocket but I do not know whose number it is."
Without mutual trust, just imagine what will happen to the couple if the taxi operator answered with just "hello" instead of "Holiday Taxi".