While there are many factors in any relationship that might lead a spouse or partner to cheat, studies have found that financial instability can contribute to adulterous behaviour. Generally among men and women, lack of variety, protracted disagreements among couples ranging from from domestic violence, to lack of expression of love and care, to a reduction in commitment are common causes of cheating. Being cheated on is no good news any wife or husband wants to hear. Unfortunately, it is rampant in many toxic and happy marriages. What can make someone cheat in Marriage ?