Why is having an emotional connection with someone besides your GF/BF considered cheating?

I don't get it...What is so wrong with connecting with someone else besides your significant other on an emotional level...I mean in my own opinion as long as both parties refrain from doing anything sexual then I wouldn't consider it cheating in my book... What's your take
Why is having an emotional connection with someone besides your GF/BF considered cheating?
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