There may be many reasons for wives to cheat such as loneliness, necessity of money, rejection, betrayal of spouse, unsatisfactory sexual relationship, misunderstandings, etc. Women cheat only when their emotional needs are not fulfilled but in most of the cases not due to physical lust. There may be some exceptions and I do not deny this. But the main reason is loneliness. If they are left alone they do not know what to do and seek out affairs outside.
Some cheating wives say that their relationship is unsatisfactory. Though they stay with their husbands their husbands are not able to fulfill their desires in the way they expect. This makes them feel lonely even with the company. More often the work or hobby of the partner may also lead her to frustration. If the attention and admiration towards her is less, she will start loving someone else who admires her. The newfound boy friend might be admiring her mainly for the sexual relationship and she would be clear of this too. Even then, she likes him because his admiration makes her happy. She willingly gives her to him and gets the admiration instead. So those who are worried about their cheating wives must first of all think whether they are satisfying their wife emotionally.
When you do not pay enough attention towards your wife she will start to feel unattractive and uncared for. She will lose her hope and this will lead her to seek relief from another person. The cheating wives are guilty until they are caught. They will be having the relationship hiding from their husbands. Once it is brought to light the whole matter would change. Sometimes they may confess their mistakes. Sometimes if they are highly frustrated of the behavior of their husbands they will continue the relationship openly after finding out. They will not be afraid to go to the extent of divorce if you stop them.
Sometimes the cheating wives do it as revenge. If you are harming her with some extra relationship, she develops the eye for an eye approach and finds her happiness elsewhere. You cannot change her attitude in this case until you change her behavior. If your existing relationship enters the mechanical phase then this will become dull and boring. She will be excited to find the new relationship very attractive and plunges into it. She would not come out of it until you change.
When you do not pay enough attention towards your wife she will start to feel unattractive and uncared for.