What is “emotional cheating”?

OlderAndWiser u
Hey, theres a woman out there who looks like maybe she knows you!
"Hey, there's a woman out there who looks like maybe she knows you!"
Another user posted this question:

Is emotionally cheating the same, better or worse than physically cheating?

I know similar questions recur frequently on G@G. My response to this user was intended to indicate one of the problems with the discussion. "What exactly," I asked, "is emotional cheating?" I suspect that this is one of those things like virginity: everybody “knows” what it is but, once the discussion starts, it is obvious that we don’t all agree about what it means. So. . . how do you define cheating?
What is “emotional cheating”?
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