Why do ex's look at your stuff?

I ended with a guy I was with back I Jan, he blocked me right after we ended and I was perplexed because I gave him no reason to block me. He unblocked me about a month and a half ago and then messaged me 2 weeks ago to congratulate me on graduating and to tell me happy birthday. But he's viewed every story on my instagram everyday. We're not friends on instagram but my page is private. Is there a reason he's creeping on my page? I understand looking at my stuff here and there but not every day.
Why do ex's look at your stuff?
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