While I stand by that yes ladder as being effective, I worked on it quite a while ago in my development. I really think this shit test is easier to deal with than that or basically any boyfriend destroyer makes it out to be. Especially if it truly is just a shit test and she doesn't actually have a bf.
My way of dealing with this now is just to be honest with my own feelings.
"Cool. I'm seeing other people too. But let's be honest with ourselves here. Life is short, we're both young, and things change quickly. I mean, what if we'd be perfect together, but instead of discovering that I walked out of here without getting to know you, all because you're seeing someone today who might be gone tomorrow?"It works because it keeps your value high, it instills a sense of loss in her, and makes her resent her bf just a little bit. Be careful though, you have to make sure you have built attraction before you pull stuff like this. If you're just going for a Number Close, a simplified version can be employed:
"That's cool. But things change quickly and who knows where we'll be tomorrow. Why don't you give me your number so we can stay in touch?"The yes ladder and more in depth BF destroyer techniques can be employed if it's a stubborn case. But most cases just require you to say something--anything--that doesn't make you sound like a total tool.