I am a strong believer in taking a hard stand. Why would you want to go out of your way to be nice to someone who has treated you so poorly? As I told BF, I wouldn't tolerate a friend treating me with such disrespect so why should I accept that from him? And more importantly, why do you want to chase after someone who doesn't want you?
I would show up looking fabulous, get straight to business, treat it strictly as a business meeting, then flash a winning smile as you're leaving and saying, "Oh, I didn't realize the time. I hate to keep people waiting! See ya."