Why my ex who hate me still follow me on IG?

My ex doesn't want to see me, he unfriended me on Facebook but he still follow me on Instagram even watches my EVERY story. He is one of my 10 most active followers.
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He broke up with me over a year ago and I don't understand why he follow my every instastory since he doesn't want to have anything to do with me. For me it is incomprehensible, when I do not want to remember someone, I do not look at his face every day.
Why my ex who hate me still follow me on IG?
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