Towards the end of 2018 I started dating a very lovely SB in her mid 20s.   We had a half dozen dates or so, and then she disappeared.  At one point she asked me to help her out with some extra $ promising she'd make it up to me.  I knew that might never happen, but I liked her and gave her $300.  No big deal, right?  Anyway, since then she was going through some tough times, an unplanned pregnancy and an abortion, getting dumped by the baby dad, an eviction, family problems, etc.  I sent her a few nice emails but never expected anything much to come of it.  Fast forward to now and she asked for a date and I spent a lovely time with her this evening.  She's in much better shape emotionally, has been at the same job for over a year, got a raise, a new place to live, and is as hot as I remembered.  She was a little tiger in bed and really wore me out.  So she's paying my back a bit at a time, and I'm kinda amazed to have her company once again.  So you never know.  Keep the lines of communication open, and sometimes the ones you lost will come back hotter than ever!

And a lesson I've been teaching for years.  There is no cost for being nice and respectful (not a pussy, just nice) and it often can deliver amazing returns in the future.  
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I have a little AA spinner (24, 4'11, 93 lbs, former minor porn star) who I met in a strip club about 4 years ago. I converted her to a SB and we went to town exploring my sexual fantasies. She originally wanted $250 per meet, including setting up a double with her friend for no extra sugar.  
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Sadly, over time she had a variety of issues (car repairs, rent, club shift fees, emergency Uber rides, etc.) and she moved to a nearby state with a lower cost of living. I'd send her $40 - $100 from emergency to emergency (she doesn't ask very often - maybe 2-3 times a year) and when she comes back to town she begs me to make time for a shag.  
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She shows up, insists on having me fuck her face hard while calling her a slut and then swallows it all after we fuck. I just toss her $40 for gas and she thanks me with an extra BJ for fun before she rolls.  
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I could have ghosted on her when she moved, but instead, I've had at least 10 sessions with her for maybe a total spend of $700.  Just being a nice guy she could count on for a few twenties to bail her out has paid me back an order of magnitude of value and fun.  
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Life is good.
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The Cat

Early last year I parted ways with Zoe (not real name), a gorgeous, kind, 24 yo SB who has one of the best bodies.  Just didn't have the bandwidth and she was #3 in the rotation.  Politely told her that it was "not her, but me...best of luck...take care..etc..."  Fast forward to a month ago, and Zoe emails how kind I was, she missed me and would I reconsider our SD/SB arrangement?  Absolutely made time for her and we picked up where we left off.  She's totally a sensual lover and it's been fun reconnecting.  Now I must let someone else down easy to make room for Zoe on the team.