Request - Best Friend's Psycho Girlfriend & False Rape Accusation

A young man is roommates with his best friend. Unfortunately his friend's girlfriend is a psycho bitch who lives next door and he fears she's trying to entrap him with a false rape/assault accusation. What are his options and how can he protect himself against her?

Need advice? Need wisdom? Need guidance? Preferably truthful?
http://www.assholeconsulting.com