I'm no guru of emotional affairs. I don't know that there are any official "levels".
One definition of an emotional affair is anything between a married person and a member of the opposite gender that the married person wouldn't want their spouse to know about. So that would cover some slightly excessive interoffice flirting that wasn't really meant to go anywhere (but would still detract attention and effort from the marriage) to full blown declarations of undying love. To me, anyway, those things are distinctly different. Neither is good or appropriate, but one is much worse than the other.
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