Fuck her friend.
It works even better if her friend is way less attractive.
It also helps if you pretend to be actually interested in her friend.
Unlike guys, who invariably wish their friend well and would not piss on his parade, girls just love screwing their best friends over by fucking their men.
It's a girl-thing.
Fuck her friend or her sister or even her mum, don't matter, just let her friend, sister, mum tell her you're packed and you'll be fucking her, too, in no time at all.
Girls are so shallow (so am I - which is why I understand them - and they me).
Seems to work, so far.:biggrin1: