Wtf? This happened to me tonight. I had a girl on fire, who chickened out mid way through the cab ride! Saying this, I'm talking about girls who get cold feet in general, but tonight it happened to be on the cab ride home.
What the hell? Is it a shit test? At the bar, she's unleashing IOIs and seals the deal, so what went wrong on the way home? Did she throw me a shit test, or was it just nerves? I have her number. I don't see the point in freezing her since I just met her, but I also don't want to txt right away and seem too desperate, or afc-like
What should I do???

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It's all in a state of mind. Be the bigger man, and you can never lose.

Sometimes it is better not to make everything to obvious. She might know deep inside what is going to happen, but try to comfort her. Have a reason to get her in your house, not try to force her. Just have a stupid reason like pancaces or something.

Are you sure you didn't say anything to make her feel uncomfortable, or something that might have implied you were going to have sex? Similar to what Magius said, she probably knew what was going to happen in the back of her mind but got scared away for a particular reason.