For the sake of our discussion here, I thought I'd put Harley's quote into context.

Also, as a point of clarification, Steven Harley is the SON of Dr. Willard Harley. As solid as his credentials are, I don't think he'd be considered the infidelity guru that his father is.

Anyway, here's the quote:

How to Survive Infidelity

The question I am most frequently asked by visitors to this web site is "how can I survive my spouse's affair?" After having counseled thousands of couples with hundreds of marital conflicts, I am completely convinced that a spouse's unfaithfulness is the most painful experience that can be inflicted in marriage. Those I've counseled who have
had the tragic misfortune of having experienced rape, physical abuse, sexual abuse of their children, and infidelity have consistently reported to me that their spouse's unfaithfulness was their very worst experience. To be convinced of the devastating impact of infidelity, you only need to go through it once.