I've written openly about my affair story. My past provides me with a particular insight into the experience of an unfaithful partner and how a person can make life-changing choices that spin the heads of confused observers. 

Because they prefer certainty over confusion, the onlookers (including the betrayed partner) often seek black-and-white explanations. They do this to understand WHY this happened, or to present a convincing argument that will compel the wayward spouse toward sensibility.

One common explanation of an affair is that it is a fantasy—the experience of something that seems real, but isn't. This condition is also referred to as wandering in an "affair fog." While I agree that understanding the fantasy and fog nature of an affair may be helpful to the unsettled witnesses and victims of infidelity, it will not persuade the cheater to think differently about their experience.