What happened there?

This is old story.:that happened a few times ago at school.. but wanted to get some answers on what may have happened and you thoughts on it… alright so at the beginning of the school year on the first day of class.. this girl came and sat next to me.. she was the one started talked to me and as the days go by she became more and more friendly with me even touchy and was calling me by pet names.. then one day she came in class and stopped talked to me was ignoring me.. she was still talking to anyone else except me, like tf is that.. she even at some point changed place to go to the front desk infront of our desk.. I have done nothing to upset her.. like what may have caused this change of behavior from her?

What happened there?
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