what makes a woman that is married become a cheater?

Answer 1

there is no one particular reason for that. she may feel that there is something lacking in her marriage, she may feel unhappy with the way the relationship is going or how her husband treats her. or she may have just found a man who made her feel attractive and wanted and she was unable to resist him. but whatever the reason is, it's wrong.

Answer 2

It depends, if her husbands is not at home or giving her enough attention. They might not be sexual compatible and he is not willing to try different things .