I'm sorry to hear that happened to you. Definitely sounds like a crappy conclusion to the evening. I'd say you certainly deserve more of an explanation...however, I wouldn't expect one. It is possible this provider grew feelings for you/felt you were growing them for her, or that at the last minute she found some information (i.e. From a reference or a blacklist) that left her uncomfortable with seeing you. If the latter is the case, I doubt you'll hear from her at all. If it's the former, hopefully she will explain herself, or you can evaluate whether you've said or done anything that could be misconstrued as becoming overly attached/emotional. However, there's also a solid chance the provider is simply flaking out, and so I wouldn't hold on to any expectations that you'll hear from her again.  
If you're certain you haven't said or done anything inappropriate, or that could make her think you're becoming too attached, then I would just move on and forget the situation. Remember, the best way to get over someone is to get under someone else

Best to not try to figure it out.  She'll either respond back or she just decided at the time she didn't want to see you again after all. Or it may have nothing to do with you personally and she just thought of something quick to say. One thing I've learned over the years is to expect the unexpected,and things can change in a heartbeat.

Steph xoxo

Women!

Met a lovely lady in N Raleigh.  Had 6-8 quality visits.  Great conversations...Great rapport.  All of a sudden my emails were not returned. Tried to replay some of our conversations to see if I had strayed boundaries!  Could not come close.

2 months later I ran into her at a local gym.  We discretely and mutually approached each other outside where it appeared safe.  I smiled, shrugged my shoulders and asked "What Gives"?  Her response was "It's not what it appears!"  About a month later she sent me an email and consented to visit.   It turns out she was being stalked, and threatened to be outed.  Her only recourse at the time was to cut ties and fly beneath the radar.

Like Steph mentioned in a previous post , you just never know what happened irl,and what was on her mind.

Carry on comrade!  Plenty of attractive ladies at this beach!