I still think a garlic necklace and a silver bullet would do wonders, Chris.
Seriously, maybe consider making new friends - ones that have no ties or clue or knowledge of your ex girlfriend. Ones that cannot be played, ones she does not know of and will never ever know of - because you are not going to broadcast that to any of your friends and relatives. They all seem to be putty in this girl's hands.
Are you able to consider even moving to another location?