It’s a perennial question. Why do women cheat? Unfortunately, there is no one perennial answer, but there are a lot of documented and observed reasons detailing this phenomenon. Some of the most common are preventable and very easy to detect. Take a good look at your relationship and see if any of the following are present. Are you taking her for granted? Did you stop doing those “little things” to show her that you care. You have to show your love. You have to show your love.