Why do people randomly block me?

JustinTheGreat
This girl I know from 10th grade blocked me on instagram and i dont know why. We aren't friends anymore but if she sees me in the hallway at school she says whats up to me so she's still friendly with me. All i did was request to follow her a while ago and now im blocked. Then this other guy blocked me too and i didn't do anything to him either.
I guess it doesn't matter that much but you gotta be a pretty unlikable person to get blocked by people for no reason..
Why do people randomly block me?
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