What causes a Woman or Man to Cheat

i think it is desire for money and happiness and apart from these the situation forces them to act in such ways

if they dont understand each othwer lack of trust

i've never been married before but i guess people cheat when they meet someone more 'interesting' and wanna find out more. sometimes, when we are together for a period of time, we tend to take our partner for granted..and when someone better comes along..we will have doubt whether do we love our partner or not...therefore, i think it's better to keep on romancing the other half...so that the spark and love is still there (irregardless of the years together!)