There's this girl I know, (let's call her Karen) we use to flirt a lot but she always rejected me when I suggested anything. Well its come to my attention that she is chasing off the girls I flirt with. I was in a bar the other day and chatting to this girl, she went to the loo with her mates and Karen apparently went in and told her all this BS about me. Up until that point everything was going ok, but after the girl disappeared. Karen has apparently done this to me several times. Why would she do this?