Why do you think would a girl remove me as a follower and from following her on Instagram?

So I don't really remember when she did that but i think it a few weeks ago, I came to know when I was just randomly checking out my followers list. She is my classmate and I wished her on her birthday too and she replied sweetly, after that she followed me but I don't post anything so maybe that's why she unfollowed me after a while but why would she remove me from following her? I don't really remember anything I did that may make her feel uncomfortable...

I am feeling a little sad for what she did cuz I personally don't see any reason for her to do that... 😔 should this be a reason for me to feel upset?
Why do you think would a girl remove me as a follower and from following her on Instagram?
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