Hey there! It's called Last Minute Resistance (LMR), I would recommend slowing it down when you get this, she could see you were faking losing interest and she played with you because she saw you really were interested and bluffing. Next time either slow down or try a different angle, never tell her you "lost interest", at least not the first few times you get LMR from girls, it's much better to learn from trying!
Regarding the girl I think you pretty much lost her, what you could do though is text her again after some time, maybe a few weeks, you could have a fresh start if you become unattached to her again

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