I think you're kinda stuck. I have a girl that I've tried to be nice to, I've tried being a dick to, I've tried ignoring, I've even said the most hatful shit i could think of, and she still won't leave me alone. Sometimes they just can't get it. There's a chick I was insane about that i dated for 4 months and she was by far the worst g/f you could have short of cheating on me. I would've dropped everything to be back with her for quite some time. I finally realized how much she sucked and got over her. Now imagine if she was a good person like you. Feelings suck and sometimes there's nothing you can do.