As defined by this Wikipedia article, I find the concept, "emotional affair," absurd, foolish and ridiculous. What is basically at stake is loving and intimate friendship, and to wish to restrict one's partner such that he/she should not have loving, intimate friendships seems to me quite perverse. >ick<
Oh, then there is this (from that article):
David Moultrup has broadly defined an extramarital affair as
a relationship between a person and someone other than (their) spouse (or lover) that has an impact on the level of intimacy, emotional distance and overall dynamic balance in the marriage. The role of an affair is to create emotional distance in the marriage.
This is a distinct issue or topic from a mere intimate and loving friendship with someone other than the lover/spouse. This kind of "affair" signals a serious problem in the initial relationship. One can have loving and intimate friendships with others without this condition present.