Since I can't Post the e-mail thread I'm going to copy-n-paste. Don't let this SB's get away with stunts gents. Keep your pimp hand strong!

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Me: Oh Brandi Brandi Brandi. My unreliable Brandi. So I've been thinking about us the past few days and I'm sorry to say that I'm going to rescind my LTA offer with you and go back to PPM. Long story short, you're not a reliable escape I'm looking for. I love hanging out with you when we do, but, I feel that you're not reliable. Maybe we can go back to an LTA in the future if you can show me that you're reliable and not rescheduling on me 2-3 times in a row.

As for tomorrow, since I haven't seen you as planned... I had to have my intimacy needs taken care of elsewhere. Hence, if we hang out tomorrow I don't need my intimacy needs fulfilled. So if you want to go on a date with no intimacy or money on my end then happy to hang out with you. Otherwise, I'll see you next time in the future if you're still interested in PPM for 3 roses. Happy Hunting.
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Her: So can you still help me out with the already decided allowance for the month? I really don't have any time to find other options and I was relying on that. Do you still want to hangout?
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Me: I'm willing to pay for our date and fill up your car tank but that's it amor. Moving forward, if you are relying on a source of income from anyone. I recommend that you're more reliable and responsive to that source of income.  

Speaking of which, I know that you're on SA multiple times a day. So you have to forgive me for wondering if you really had car issues and rescheduled twice on me this week for legit reasons. Or, because you sidelined me for potentially better deals. If the second latter is the case:

1) you need to be upfront and honest with me. It's a mutual courtesy and respect that I expect. And not make up some convenient excuses on days we scheduled to meet

2)a bird in a hand is worth 2 in the bush. Basically you fucked up with me as a reliable source of income amor. I may not pay the most but I am reliable, safe, fun, respectful, and treat you well.  

There's a reason why some guys pay out the ass. It's usually because there's something off about them

Other than rescinding the LTA allowance part. As to when and whom I would be intimate with, would be none of her business and to a more sophisticated SB that sort of signalling ahead would indicate some butt hurt feelings!

As for me, I am detecting an ever growing enthusiasm gap between the Unicorn and I as she has become a little more delayed with her responses and more telling, she has now deactivated her SA profile. Since I know that it was not done to keep me "content", I am assuming that I am going to be a second fiddle or a second option thing.

I think that I am going to rescind my LTA too and just keep it PPM if I want to. I may just tell her when face-to-face that I want to hit the pause button. The lack of enthusiasm, lethargy BCD and a bit more creativity from me to juggle and plan ahead are all indicating toward a break. It remains to be seen as to whether I'm going to be dealing with a boomerang or a gonner.

But back to OP: reliability and steadiness is what ought to earn them LTA consideration and respect. Otherwise, no, no, no!!!

If you want to dump her, just go ahead and do it. No need to browbeat her over it. and why in the fuck would you want to hang out with her, and even more germaine, why would she want to hang out with you after receiving such a message from you?

It sounds like she really got under your skin, and further more it validates the policies of many of us who NEVER pay a monthly or weekly allowance. I am a firm believer in "pay as you go" where it comes to pussy, I think you would be wise to do so as well, this way if an SB flakes on you, you can just go get laid somewhere else without any of these hard feelings you seem to harbor.

Lastly, I really can't relate to the whole, "I got laid yesterday so I don't need to get laid tomorrow" line of reasoning, Unless I got laid 30 minutes before my scheduled date with a woman, I am still going to want "intimacy", ok lets please call it what it is. I still want to FUCK. lol

Again, I hate to sound harsh, but you are really mad at yourself, or at least you should be for allowing the situation to get to this point in the first place.

On some level, I think we've all been flaked on enough times that it prob felt a little good to tell her that HER unreliability is the reason the relationship is ending and that her actions and flakiness are only screwing herself, although i agree it prob could have been handled a bit more delicately. My current SB totally stood me up on our 2nd date NCNS after I had paid for the hotel and everything. I was more disappointed than pissed and while I could have sent her a nasty email or vm, I played the long game and she finally apologized and now things with her are going pretty smoothly.  

Imo, GD could have given her a warning that if she flaked on her again then they were done, but you could also argue that is just setting yourself up to eventually get stood up again if you don't put your foot down.

I had a SB show up 2 hours late. I told thats disrespectful and if it happened again we were done. I m pretty sure no one had ever called her on her poir behaviour. We were done inside of 2 weeks lol.

Even though I am totally on board with feeling dissed and pissed when she is late, or worse a true no show, I see little point in beating this issue into the ground.  It would leave a very bad feeling and make it nearly impossible to repair the arrangement.  I would just tell her to be on time next time, and if she is, and she apologizes and "makes it up to me" then no worries.  If not, dump her and move on.

Tricky issue to work through.  I believe your straightforward feedback is useful to maintain your authority:  

1. You are not reliable - so no more LTA.  
2. You are accountable for your commitments, as am I.  
3. I have other options (implies she needs you more than you need her).  

I recently had to take a similar stance with a 19 yr old SB after 3 weeks.  Told her in in a text in very certain terms that I am not her driver/Uber bitch, her laptop tech, not giving her my PayPal account ID/pass (can you imagine?!?), not talking to her room-mate to ask if she can stay another month w/o rent, etc. Made it clear I will see her 2 to 3 times a month for a set gift.  That's it.  

She responded after 4 hours with "ok".  Since that time she had tested me 4 or 5 times asking for an Uber (no), to take her laptop to the shop (no), if she can see me 3 times/week (hell no!) and more. She always replies "ok".  I set our next meet for Wed of next week. The experiment goes on.