Just tell her
Visitor's Question from a 16-20 year old Female
I have a friend that always likes the same guys I like, and will sometimes say she can't go to things, to get me out of the way, and goes anyway, to try and get a chance with him. How do i get her to stop?
Tell her you are on to her game and tell her to stop.
It would be ok if she did this to one or two guys that you were interested in because "all is fair in love and war." But for her to go after all the guys you are interested in is wrong.
-- from George
One of Your Friendly Advisors at RomanceClass.com