Good luck man, that's a tough one.
My .02... Let it go. You can't see someone that often that you care strongly about and not feel something. Tell her you can't be freinds if you can't. Tell her you still have feelings and it's fucking up your steeze to see her all the time but maybe once you have a chance to circle your wagons and get over her you can try again. Also, by showing her it's all or nothing might get it into her head that if she wants you in her life it's time to make a decision either way instead of playing games and being immature about it, i.e.- waiting until AFTER you take her to an expensive dinner to be real with you etc.
Honestly the "lets be friends" stuff only really works if you're not that into each other. You need to tell her what's up, but also be honest with yourself about it- you need to let her go 100% if she is going to continue to flake out on you. Seriously, letting people who are careless with your emotions stomp around inside your head is so unhealthy it isn't even funny. Patch it up or peace it out. Good luck broseph.
you sound crazy as fuck.
It's kind of hot. You should fuck me to get back at him.