Met this girl at a party Wednesday night.

Texted her the next morning, "Hey this is (name) and this is my number haha" to which she responded, "Okay! Got it." I left it at that.

Sunday evening I text her.

"Hey risky business (her halloween costume), what's up?" No response.

Today I text her.

Me: "Huh I think I just saw your twin go by."
Her: "Lol maybe it was me"
Me:"Hmm I don't think you were walking around on the 7th floor of my school... or were you? Haha"
Her: "Yeah I was stalking you haha no that wasn't me."
Me:"That's good. I have enough stalkers as it is haha. So when am I seeing you again?"
Her: "Umm I don't know"
Me:"Well I have a lot going on this week, but I could hang out on Thursday night if you're free."

It's been about an hour, but normally she had been responding between 5-15 minutes before that so I'm not anticipating an answer at this point. What went wrong and what should I do if I don't get a response?

you went for the meetup too quickly. unless it was really on when you first met her this won't work, you need to game her via text and get her wanting you again before asking for the meet.

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"advance until resistance is met"
- Julius Caesar, Rome

THIS. +

Avoid to ask her out instead take her out. You lead she follows. Girls just love someone who's in control. This counts for everything : sex , life , job , school.

You lead.

Okay, the only reason I rushed it was because I thought texting was more a means to arranging meet ups and not really supposed to be for much conversation.

How would you guys go about "taking" her out rather than "asking" her out when you live in a city and don't have a car

I say she would have answered right away if you had replaced "but I could hang out on Thursday night if you're free." with for example "Do you want to go out with me on Thursday night at 8pm?"
You make yourself vulnerable with that, and show you are unafraid to put your head in the guillotine and that is confidence. And what do women think about confidence?
Also by adding the 8pm shows you are leading etc.. more confidence.

But I don't know enough to tell you what to do next. But definitely if all seems lost think about trying this line or similar.

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AFC from hell

Good point, I thought narrowing it down to Thursday night was good enough, but a time would have been better looking back. I guess I was scared to put something so specific because I don't have any solid plans other than me going to her place or she coming to mine. Ideally I would wait it out and text her during the day Thursday or Friday, but I work 3-11 on Saturday and Sunday anyway so there's not much of a chance of seeing her until next week either.

Not to mention I thought I was clever with that twin thing and I hate to have to go back to just "Hey", but I'm out of witty texts like that to get a response to.

Hehe you took the least important part of the answer and made it the central issue, Thursday might just have been good enough. The 8pm is not necessary, it's just better and increases the chances of reply a bit, lets say she's busy until 9pm, she might have called the whole Thursday off, however if you add a 8pm, she might not call it off but instead move it to 9pm. But the main issue is, you did not ask her out. You were rude. Not a day goes by while a woman is not thinking about when somebody will ask her out. And you didn't. You owe her that to really ask her out.

There's no spinal-core paralyzing AA here, this is text we are talking about. You don't need to worry about your body language after asking something courageous because this is text. And you didn't even ask courageously through the text!

DO YOU WANT TO GO OUT WITH ME? = courageous, confident, satisfying the need of women to be asked out. Surprise!
I CAN HANG OUT WITH YOU IF YOU ARE FREE = non-courageous, non-confident, not satisfying the need of women to be asked out. Disappointment!

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AFC from hell

Even replace ' Do you want to hang out friday at 8pm' to 'lets go out ..' or 'we should hang out ...'

They are better ............ in a real encounter situation, because it's not as ballsy and no need for the spine to shake after saying it, but we're talking about text message here. No need to tailor the text message after what's best for the AFCs in the field. We must of course capitalize on the text message and project ourselves as ultra confident as possible through it.

Not only does it increase the likelihood of a yes, when the yes comes, the fake ultra confidence behind the text message converts into real confidence 0.1 seconds after the yes is received.

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AFC from hell