Affair fog. The mysterious mind-altering cloud that seems to descend on people caught up in affairs. It's an apt term, because it captures the idea that the cheater is no longer seeing the world clearly, that they've lost their old sense of direction, that they are now wandering around in a dreamy haze, heedless to the world around them. Peering through the fog the only thing they seem to see clearly is their affair partner - who stands out as a dazzling source of light and wonder. Their spouse, when they notice them at all, is a dull obstacle that stands in their way. They may even look backwards, and rewrite the history of their marriage from this new perspective - emphasizing all the negative experiences and unhappy memories, and downplaying the joys and love.  
 
So, what's going on? Have they lost their mind? Have they really fallen under the bewitching spell of their affair partner? Why can't they see what is so obvious to everyone around them: that they are an everyday cheater making a fool of themselves, and harming the people that love them? 
 
As a neuroscientist, I tend to look at this from the perspective that such large-scale changes in mood, perception, and behavior must have their origins in the brain. So, the answer to the puzzle of affair fog lies in figuring out what's going on in our heads.  ​

I've heard this story before: you have a strong emotional connection with your affair partner and believe your affair is uniquely wonderful. Even though your affair is probably among the 96% destined to fail, you remain convinced (like so many before you) that yours is an exceptional experience. But belief doesn’t change the fact that it almost certainly is not.

I know this because I once told that story, too.