Why would your ex block you on instagram only if you don't even follow each other and talk on it?

Her profile is private and we used to talk on a different platform..
She used to watch my stories, and she blocked me after i kicked her because she threw crumbs at me and backing off..
It just doesn't make sense blocking someone in a place you don't even follow and talk and also your profile is private
Why would your ex block you on instagram only if you don't even follow each other and talk on it?
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