When does it cross over from friendship to an emotional affair?

Anonymous
At what point is a relationship an emotional affair? If there is no sex involved what makes it an emotional affair? Is it the desire to have sex but don't? I have both a male best friend and a female one and I am married but share everything with these other two people does this cross the line? Can you even have an emotional affair with someone of the same sex if you are heterosexual?
When does it cross over from friendship to an emotional affair?
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