Why do some girls do this?

My crush's ex found my ig account 🤣. Why would she find my ig account and block me? I never gave her my account. Is it just me and her or do all girls stalk their crush's account? Do you think he was searching my account and she found out? He had a thing for me and she got jealous before. I believe he only got with her just to try to get over me.
Why do some girls do this?
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