OK, we all know the golden rule: thou shalt not steal thy BFF's BF or crush. Sure, you might not be pulling a Serena any time soon, and actually hooking up with your friend's guy (your life isn't a Gossip Girl soap opera, thankyouverymuch). But are you inadvertently -- or not so inadvertently -- sabotaging your friends' relationships with boys? Keep clicking for signs that you might wanna check yourself.

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