What happened there, why she is acted like that?

Alright it’s a story that happened a while ago but I still wanna know what’s happened: At the beginning of the school year this girl (that I didn’t know at the time) came and sit next to me, she is the one that started talking to me and as days go by she became more and more friendly and even touchy, was even called me by pet names, this lasted for like 1 month and then suddenly one day she came in class and she started to ignores me while I have doing nothing to upset her and she was still taking to other peoples except me, she even later changed place to go sit to the front desk infront of us, what could have explain this behavior from her?

What happened there, why she is acted like that?
Post Opinion