So I approached a girl about one and a half month ago. She was a pretty shy type of girl, but instantly gave the impression she liked me. I was in a crowd of a festival en stood right behind her and she was texting someone. I could read the text and said something about it. She said thanks and started asking questions like where do I go to school, ... So after 10 minutes she said she had to leave because her dad was picking her up (I'm 17 years old and she 16). So I number closed. So i had like 3 weeks later a date with her on a saturday night. I took her to a bar where I already knew everything and she didn't. She responded very well: she copied a lot of my body language, was very interested in me, ... About one and a half hour later when her dad came to pick her up (I said I had to leave), when we said goodbye, she tried to kiss me on the cheek and I kissed her on the mouth on purpose. So we had a bit of a weird kiss, and I looked her in the eyes and said: " See ya next time" with a smooth voice. 2 days later she texted me she really liked the date. I texted something very short back and then said I had to go and couldn't text her back.
Since then I called her for another date. But the day of the date I texted her I couldn't make it.
I texted her since then once, but she didn't seem interested anymore.

So what did I wrong?

PS: I didn't like the girl and I don't care about her, but I want to learn from it.

I believe there the asnwers, maybe she figured it out.

totally agree w/HPM.

you conveyed too much disenterest because guess what - you actually didn't like her! There is aloofness and then there is what you describe.

I did the same thing this summer and it was a fuckin waste of time. live and learn.