What happened there?

Here’s a chronology of a old story that happened witha girl few years ago- (school yr 2021-2022)
*At the beginning of the school year*

Late August to mid-Nov 2021: This girl sat next to meon the first day, starts talking to me and we becamemore and more friendly as days go by, she was evenvery touchy with me (this lasted 1 month and a half)

Early Nov 2021: This girl came in class one day andsuddenly starts ignoring me, she was talking withother peoples except me, really acted like I didn’texist while I haven’t done nothing to her, since thenwe never spoke again..

Early Dec 2021: she decided to change place to moveto the desk infront of where we were seating,

Early Feb 2022: At first I only considered her as afriend but when she started ignoring me I developedfeelings for her, so I added her on snap, this the firsttime we spoke since early Nov I told her I liked herand she told me that she had a boyfriend..

March/April/May 2022: we spoke time by time onsnap, even wished her happy birthday in early May, and this was the last time I ever spoke to her, sincethen, I have never talked to her til this day..

It’s been a few years and I’m still wondering whatcould I have done wrong for her to be acting like this lmao?

What happened there?
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