Good, you're doing it right.
I'll forgive a chick one flake, if she does it a second time in a row and wastes my time then she's done. At that point, I'll just send an open ended invite to come to my place to bang if she's ever dtf. No dates, no dinners, no more communication, just come over and get naked. You weed out the attention seekers just seeking validation that string dudes along and never put out. A woman's value is her Pu$$y, a man's value is his time and attention. If you're investing your time and attention and not getting anything in return then quickly next.