put it all on the line... like make out ur not intrested at all or get in like a half argument half discussion on purpose, say something like well look ur fucking with my head, either be my mate, be something more or rite now just piss off all together, if she thinks shes going to loose you and reacts like "no jonny, dont be like that!" then it shows she wants u in her life...if on the other hand shes like fine whtever... then u dont need her in ur life ne way ur better off without her...
also WZ mite nt be the best place to get advice though it may try, id say about 70 % here probably have no luck with woman at all lol but more importantly they dont know you and they dont know her, speak to one of ur mates hu knows the situation, sure u mite loose face and look like a man with "feelings" but if hes a good enuff mate his or her advice will show u better thn ne of us could