It's going to happen to you. Trust me. It may be her choice or yours, but ultimately it will happen. Here's my story:  
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We've been in a arrangement for 3-weeks short of 2 years. She calls me her BF and has me call her my GF when with my friends. Her friends for the most part don't know I exist - though they suspect she has "someone" in her life who's been giving her sugar/support/mentoring/etc. Her mother has met me and we've carefully skirted around any explicit discussion of my relationship with her daughter. But Mom has SD's of her own, she's not stupid. Only one of my friends knows I sugar and bang multiple chicks a month. He's jealous as hell and keeps my secrets.  
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We went to monthly allowance after 9 months together and it (unexpectedly) worked out well. She delivered on her side with regular time, sex, and travel companionship as agreed and asked. I delivered on regular allowance (about 75% of her rent), plus other small gifts on occasion like grocery shopping, birthday presents, paid her traffic fine, etc.  My total monthly investment added up to about $1,500 a month, which got me laid weekly or more, mostly on demand. Plus she happily did my laundry when at my place - something I actually valued almost as much as the sex because I hate laundry. LOL  
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I've been trying to coach her out of her poor financial state be helping her with career guidance and goal setting/attainment, as well as lots of discussions about how/why to truly prioritize her spending on what she NEEDS and not what she WANTS. That's been the hardest lesson for her to learn, and I'd say she's not making nearly enough progress to show that she's maturing from wannabe princess to responsible adult.  
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I know she has been seeing other SD's, and I've been ok with that. I never signed up to fully fund her monetary asks and I'd be a hypocrite to be bothered by her getting cash for sex for "needed" funds her job and I don't provide. As do I, she's very careful about positing references or pics of her time with a SD on social media. Careful, but not perfect. I have seen her pics going to a Lakers game, sailing on a party boat around the Marina, and attending celebrity/rapper/ultra rich private parties that she should never be able to access without a sugar path.  A few times she's posted a pic of her with another guy (presumably a relative or incidental stranger), or posted a vid where you can hear an unknown guy in the background (sometimes it was me).  I never ask about these guys and tell her I don't want to know. Not interested in creating some jealousy drama. Her time away from me is her time. Her cash - whether from my sugar, some other guy's sugar, or actual payroll form her job - is hers. BUT...  
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But she crossed a line I didn't know I had until she crossed it. And it upset me enough to drop her.  I'm in the process of rebuilding my rotation anyway, so I just need to fill one more slot (so to speak .   Here's what she did:  
She is an aspiring chef and has been applying for culinary schools and trying to get enough financial support/sugar to pay the tuition - somewhere between $30k up to $200k depending on the school. I've helped her from time to time by buying her chef stuff, taking her to celebrity restaurants and helping her learn how to save and budget.  From time to time she's asked me for cash to fund a chef-type event like attending a food festival, a celeb chef meet & greet, etc. When she asked me to pay $600 to get her a 3-day trip to Vegas for an international food expo, I was happy to help.  The red flags started there. 1. I could not find any food expo occurring in Vegas at that time .  I've been to Vegas a BUNCH and I know how to find scheduled events and navigate booking air, hotel, etc. But I drew a blank - could not verify the event was real or where it was, so booking the best hotel was a challenge. 2. She had a hotel preference (expensive, of course) but it was far from where she said the expo was and I knew she'd have to pay for a ton of taxi fares if she wasn't at or next to the hotel. I was not going to fund an additional $200+ in taxi fares when she could stay local to the event. We settled on a closer hotel but I was surprised she was not worried about getting around without a car or Uber (she can't get an Uber acct - long story).  3. I booked the trip and on the appointed day off she went.  3. No food pics or snaps. She's ALWAYS taking pics of her restaurant food. Always. But at an international food expo, nothing, and no pics of her with celeb chefs.  I even asked her by text how it was going, who she had met and what foods she had tried. Her answers were vague. What I did see was pics of her at the Mirage pool, pool bar, pool waterfall, and the major clubs on the Strip - the kind of clubs I could never get into without a 20-something hottie or four by my side.  But that wasn't the crossed line. It was who she was with in the pics that clinched it. She was there, on my generosity, on the premise of helping her career, on extra sugar beyond her agreed-to allowance, to party with another guy.  A lot. I was able to back track him from his social media account - they were both posting and "liking" each other's pics and vids. And that's what pissed me off. Like I said, I don't care who else she bangs. I do care if she lies to me for money to bang someone else.  
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Conclusion: I didn't talk to her for a week after she got back.  Just left her on ignore. Then I told her I'd be stopping by her place and she replied yes - she was super horny.   Got there at the appointed time and just explained that I was done with the arrangement. I needed to move on and make some changes in my life, blah, blah, blah... She cried (because she realized she'd just lost about 75% of her income, and perhaps she'd lost a valued friend as well), and asked a few questions: was there someone else, am I mad, are we still friends, etc. I never busted her; didn't want the drama. I was not angry or emotional, just calm and rational. But I was prepared to bust her if she tried to push me for or negotiate for another month or two of rent. She didn't (to her credit). So now I've just reclaimed a HUGE budget for future sugar and, as I've said so many times before....
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Life is good.  
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The Cat