While Demi Lovato says she feels “very lucky” to have Selena Gomez as a best friend, Justin Bieber’s girlfriend expects Demi to stay straight – or else… If you read Selena’s words carefully they contain a clear warning to Demi that she is getting no more chances!Demi is a self-admitted former drug addict, bulimic, and cutter and Selena has little patience and tolerance for this sort of behavior. Demi says she considers Selena to be one of her closest friends but rarely gets to see her because they both work so much. At least that is the party line.