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First of all, dont not do anything that you want to do just because you are nervous about running into her. Do exactly what you want to do and your frame will show it.
Second, if you do run into her, be nice. There is nothing wrong with acknowledging that its nice to see her. And leave it at that. Keep a strong frame. Being able to say hello and be nice and still be cool and smooth will go a long way. Who knows? You may have a really hot girl on your arm when you see her. Sometimes a woman may need to see exactly that to realize what she is missing out on.
Still, just be cool. You are the prize! There are plenty of 10's out there and the one you really want wants you too.
Yea, I agree with most of that. Personally I wouldn't be 'nice' to her, especially if she is a 10. I would be a playful jerk, although I definitely wouldn't complain about or allude to her flaking on you in any way. Hot girls love challenges; and in my experience, as soon as you start acting 'nice' towards one (before you've had sex with her), then you're probably not going to get her.
Keep the dominant frame, and indirectly show this girl that her decision to flake on you was the worst decision of her life. If she felt attraction for you once, she can feel it again. If you are dominant in your frame, then your beliefs will become hers, most importantly your belief that there is no awkwardness or dejection between you two. Don't try to seduce her. Make yourself a challenge, as well as socially attractive (with other people, preferably girls), and she may come crawling back.