Why did she ignores me?

There this one girl that is in my class since late August/early September she been seating next to me since the first day and we became pretty much friends. She used to be very talkative enthusiastic flirty and even very touchy with me, she even called me by pet names, and now recently she started to ignores me and I have done nothing to upset her, and she will still talks to everyone else in class except me, so it’s not like she isn’t in the mood for talking. Why she acting like this, is she playing hard to get with me? Despite all of this I still have feelings for her and I know she have some for me aswell…..
Why did she ignores me?
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