My advice is forget about this female.
And learn how to not want attention from females who dont value you or your resources.
Learn how to respect yourself, and set up boundaries so that you dont have to worry about this kind of behavior from these types of females.
The ONLY thing I would advise you is to affirm along the lines of "Yeah, I guess we DID have a falling out since you stopped replying to me and stood me up when we were finally going to meet. I had to assume you were not interested in maintaining our relationship, nor certainly progressing further. At least this is the message you put out to me. "
Dont ask for her attention anymore.
And dont give of yourself and resources unless she somehow magiclly does a 180. Seriously, learn from this kind of behavior, and put it on your 'Red Flag' list of deal breakers.
Respect yourself and maintain your honor and dignity.
People who VALUE YOU WILL reply to you. Sure, maybe things might get in the way, but when someone completely IGNORES you, take it as a sign they're not interested in you.
And it's ok, it's on them, not you.
Work on being your most attractive self, and having a good life independent from female companionship.
Really. Trust me.
Even when you're down, try to improve, learn, and grow.
If you can't stand being alone with yourself, then you wil ALWAYS be NEEDY for a female. And never have enough to GIVE, you will ALWAYS TAKE from her. Not good.
Even a great high class woman can only enhance your life, not CREATE it.
SHe can only ADD the little that SHE has to your life, and if you have no life, she will not be able to handle the entire VOID.
Not every guy has the most fantastic lifestyle, so they look externally for things to MAKE them 'happy'. But happiness is an internal state that can be very fleeting sometimes, and only true FULFILLMENT is what will be consistent.
Look for FULFILLMENT and PURPOSE. Not purely EXTERNAL gratifications.
Work on living your dream life. And if a good woman who respects you happens to show up, then welcome her to add her gifts to you, and share yours with her.
You cannot do this when you are an empty shell of a Man.
Think about this.
This is why your number One duty is to live up to your fullest, maximum Potential. I mean, you dont really have a choice. You really dont.
You need to be doing the things you love and enjoy, and THEN you will have the mature, and healthy perspective to deal with boundary/respect issues like this easily, and with Class.
Too many guys who are STARVED for female attention let women treat them like this, and these guys are so hungry for attention from females, they will willingly put aside their dignity and self respect.
Dont be one of them.