Airborne I have a friend just like this. There is a girl who he has regarded as "his" for the last 2 years and she hasn't got the slightest bit of interest in him romantically (although they are great friends). She has told me this herself and I assume she's not lying.
It does get really irritating the way he makes enemies of people who she shows any kind of interest in. In fact I think he's had some kind of grudge against me since a whole bunch of us went out one evening about a month ago, and she was being quite flirty with me most of that night. Anyway, I digress.
If this friend is anything like mine, you'll need to get her to tell him the truth about the way she feels because he probably won't believe anyone else who tells him. Unfortunately, this will be fairly difficult to achieve if the girl is afraid of hurting his feelings.




lol