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I'll give a few:  Lies as people can make up false personas, the distance, let's be honest most of us aren't Hercules willing to go the distance, and my final reason, Emotional detachment, easily happens due to the distance emotional love is hard to maintain online.

The main reason online relationships suck is because you cant really see the other person face to face, it ruins the love you got for them



also you can js say love you to the other person on chat and go cheat in peace (joke)