Don't assume the worst just yet - flakiness goes with the demographic we like to play in.   I wouldn't be surprised if she pops back up in the near future with some kind of explanation.  These girls usually have all kinds of levels of drama in their lives - could be as basic as not paying her phone bill all the way up to major family or legal issues.  Double it if she has a kid / baby-daddy, etc.  You might in the end be glad she kept you at arm's length if something big was going on, and waited until she was available for fun again.  You're right about the feelings and concern.  But when I was close enough to a girl that she 'let me in' too all the goings on in her life, it ended up making me feel more sad and sorry for her and her family than attracted to her, not to mention it put me front and center as a potential source for help for all the various issues - well outside the normal allowance-and-play relationship.

And of course, there's the obvious possibility she's found someone else or just wanted to go cold-turkey off of the sugar lifestyle, but I wouldn't chalk it up to that after one round of bad communication, especially if you were close like you say.  Good luck and hope you get an answer if she's someone you were really concerned for.

Sorry to say, this is a standard tactic among millennials particularly....
They communicate almost exclusively on electronic devices, and dating apps are particularly fierce
in the 'swipe left and you're history' mode of dismissal.
You can often see them sitting together, what you don't know is that they are texting one another rather than speaking directly together. This creates, among other problems, a distinct inability to handle face-to-face communication, particularly when the topic is awkward...They prefer to handle things electronically (even breaking up a long-term relationship by text) and radio silence is understood to be an option.
So, if you want the sweet nectar of youth, get used to this phenomenon.
Some on this  board would say, return to this overflowing Bowl, keeping your rotation full of second-string options, even lining up several for a given window of opportunity, which thoroughly ameliorates the disappointment of a ghost or no-show.

Conversely, l have had several millennial SB's be consistently punctual, even early, and l note that they tend to be less BSC than the rest as well.

Yes, sir, being ghosted is part of the deal.  They haven’t any people skills, can’t face a problem or self perceived issue.  Just go get one of your other SB’s and  taste the young pootang and forget about being ghosted.  That girl will probably pop up again.  Enjoy the bowl.

The gentlemen ahead of me expressed all my thoughts very eloquently
Unfortunately, just had a SB  move in with me for two weeks since she had nowhere else to live
She carries on 3 hr facetime conversations with her friends
Almost a different reality that you and I would know.
Ghosting is almost just another way of expression.
otho, we are asking these girls to deviate from the norm...aka fucking old guys for an "arrangement"
Guess it just goes with the territory.

Thanks for all the good advice. It’s probably for the best if I don’t know too much about their personal life. It’s hard because I do believe that it’s easy to develop feelings for them. And that usually leads to extended discussions. After being married for over 25 years, I’m trying to make up for lost time by enjoying the company of many different beautiful young ladies. I must say I wish I had discovered the sugar bowl a long time ago. I just need to get better at removing the emotions.  

Just curious, have any of you ever transitioned a relationship to a non paid one?  I had one SB where we hit it off really well. From the first meeting she was always saying such nice things and it appeared to be sincere so I thought I would test the waters and ask if she would see me without the money. Of course you can guess the answer was no. Ha, it’s funny how fast they can turn. I understand the game, just thought I’d test it once and see if I could get surprised.

You had at least one BCD session before she ghosted on you.  
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I've had my share of ghosts just like any SD here. But with me,  I've seen more of it happening as a NSNC or just a "sorry, changed my mind" on the day of our M&G than our 1st scheduled BCD. A little about the two most egregious of these:  

1. There was a cute, shy 18 year old HS Senior who lives a half a mile from me and was desperate for cash (I mean seriously, right out of Penthouse Forum!). Met her at a local Starbucks, talked for about 45 minutes and she seemed into me and happy to close that night. Drove her to my place (a 4 minute trip) and brought her inside.  She immediately tensed up and just sat on the sofa looking at the floor. I tried to sit next her and put my hand on her shoulder and she looked terrified. So I just said, "hey, you're really not ready for this. Come on, I'll take you home."  Dropped her off at the end of her block and never heard from her again.  
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2. Got a message from a 27-ish blond built like trade show model semi-pro type (i.e.: Not as tight as a swimsuit model, but big tits, tiny waist, medium hips, big lips and big hair). Insisted in driving to my place from Hollywood asap (about a 40 min drive at 6 pm) and we agreed on the sugar.  At 7, she texts me she's arrived. I look out my door and can't see her car. But a minute later she walks up to my door. She puts one foot inside - literally one foot - and then turns around and says she forgot something in her car. I watch her walk away, knowing that would be the only look I would ever get at that very tasty looking ass... A few minutes go by and she texts me: "Sorry, I can't".  And that's it, Ghosted from there. The next day her profile disappeared or she blocked me.  
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The rest are mostly ghostings within one or two hours of a M&G.  I'd say it's about 15-25% of the M&G's I set up. But the rate definietly skews higher with younger SB's.

I had one I became very attached too.  We had 2 dates, then after winter break she told me she couldn’t do it anymore.  I was devistated.  Another one went radio silent about the same time, contacted me this past week when I responded she ghosted me again.  

I’m learning not to become emotionally involved.  I do have one who had become a friend with benefits and doesn’t charge.  Another one that just likes to give bbbj with cim nqns for free because she thinks it’s hot that I’m married, no charge.  

I do have a few new spinners that are young and amazing.  No emotion for me and it will work better.  

...about guys not wanting to meet IRL, etc. In fact, had this happen last week. Tried to set up a Saturday meeting, aaannnd....nada. No response. Sigh.

I'm currently experiencing Ghosting well after the fact of meeting with 2 of my regulars.  One I have gone BCD with and the other we have almost gone BCD, but then medical emergency happened (I'm thinking, right... maybe).  I usually try to contact my SB's every two days or so with just a short message just to let them know I'm thinking about them.  Most of the time my text gets a response.  Lately - with two of my regulars currently, I'm now waiting 4 to 7 days with them not responding back at all.  Then when they do - they continue on like nothing has transpired.  The emotion I have is "it takes less than 5 seconds to text back anything", so I find myself hating this method of communication - but I digress.  I had jumped off SA, as I thought i had a stable of reliable SB's, but they can turn into Ghosts, or at least flakey in an instant.  Now I'm thinking I have to re-join SA to keep the pool filled.  

Have any others had an issue like this with regulars also?  

A follow-up question, on SA do you pay for longer term memberships, instead of their monthly amount?