I tried a SB a few years ago. In the first week it was a constant one-way street, with everything going her way. It was a nonstop request for $$$$$; rent, fix her car, pay off her cc, etc. After every request for money it was "I'll take care of you soon, baby, I just need the money now."
The last request for money she did not even get out of the car, just drove up next to mine and assumed she would drive off with cash. She could not even bother to give me a hug or say hello. I realized at that moment what I needed to do.
When she asked for the money I simply said no and told her why. With little emotion she said "Fuck You" and drove off.
OP, I wish you well and hope you have better luck than I did.