Imp and Fish are having a bit of fun here... which I appreciate. It's important to keep a sense of humor in the Sugar Bowl. If you get too serious about these decisions, you will end up chasing a girl, your money, or both right down the drain.
As to how to evaluate your options, I'll try to lay out what I see are the relevant considerations:
1. Truth: People lie. SB's lie, SD's lie, family lies, coworkers lie, politician lie, clergy lie. It's built into our psychology - we lie - sometimes. So don't waste too much time trying to prove she told you the truth. She told you the "truth" she wanted you to have, so take her at face value and go from there. If you HAVE to prove she's not lying, then you already know you're done with her.
2. Drug abuse sucks. It ruins the lives of anyone it touches. Those that can escape that life deserve the love and support of anyone who can give it - until/unless they get trapped again.
3. There are no guarantees in the Sugar Bowl - and all arrangements end. Always. Enjoy it while it lasts, try not to end a good arrangement if you can do so with a reasonable amount of effort, but know that like the entropy of the universe, it will end at some point.
4. What are your real risks of saying yes?
- She may still be a drug addict. You will end up tossing a few months' allowance (plus a bit more) out the window before you find out. So, is losing another $1k-5k over the next 2-3 months a serious hit to your disposable cash?
- She may still be seeing the "rich dude." You've probably already lived through that reality as she was likely seeing him before your "text spat." Let's double down on this: she was, or at least might have been seeing other SD's as well. If you were only seeing her 2 times a week, that leaves her up to 5 days a week to see other SD's (or a BF, or GF, or?). Never assume your SB is monogamous, unless you have specifically agreed to be, AND you are providing enough allowance that she has no need to get allowance from anyone else (I mean like at least $10k a month or more). Even then...
- This will become a recurring pattern. That may be a positive or a negative, depending on your point of view. If you like the idea of having her in your rotation for 3 out of 5 months and having some other SB(s) in your rotation to fill the gaps, this could work well as you can rotate your pussy as you rotate your favorite restaurants (steak, then sushi, then French, etc.). Or if you want just one (near) perfect SB at a time, you will need to reevaluate this again and again...
5. What are your risks of saying no?
- You start your search anew. Like Papa Sweet (sweetman) recommends, you can/should always (or at least frequently) be looking at new and existing profiles to keep a few SB's on deck. Some, like Pappa Sweet and myself, keep an active rotation of SB's at all times. Some are on what I call my A-list: actively seeing on a regular schedule, some on my B-list: usually available on short notice as a back-up when an A-list is not available or cancels, or they reach out to me when they want to/they are in town/their current SD bails, or they just want some dick (read: new shoes).
- You will have to pay more for the next SB. No, you won't - if you learn (or maintain) good negotiating skills and work through enough profiles over time. Still costs for related expenses like dining out, gifts, rent/hotel etc., will all eventually increase - so this risk is not specific to your lost SB.
Bottom line: Based on your post, it sounds like resuming the allowance with her is not a major block in going forward; you can afford to drop the $1xxx on her without jeopardizing your financial future. She's young, and young people make mistakes. That's how they (and we) learn about life and develop what many SB's appreciate about their SD (after the cash): Wisdom. You can be wise enough to allow her to recover from a big mistake with grace, and you can be wise enough to know how much you will appreciate banging her 2x a week.
Life is good
The Cat