Why is my ex stalking my Instagram from his fake account? Read description?

Anonymous
He told me about his fake account when we were still together around 2 years ago. He forgets things so he must've forgotten about it but I remember and I'm 100% sure it's him. We broke up 6 months ago (accurately) when he cheated on me and said that he doesn't love me anymore. I took no time to move on because.. it was a toxic relationship and he used to tell me that I suck (as a person) and my voice squeakishly sucks (I sing) so I was rather happy that it was finally over. We didn't text or talk at all after breakup. He was the one to block me on Instagram and he followed me from his fake account before blocking me from the real one. In the six months, he never stopped looking at my stories and he unfollowed and then followed thrice at different times. My stories aren't even related to him or relationships. And my account is public.. I don't know why he stalks me.. at the moment I'm unfollowed by his fake account but he still views my stories everyday.
Why is my ex stalking my Instagram from his fake account? Read description?
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