Why did my ex unblock me on IG after three years?

We broke up three years ago. We both have been in relationships since but I got out of mine last year and it looks like he has too just recently (not sure). I am veryyy confused because I thought he hated me cause we haven't spoken since and I've tried to win him back for a while. Some1 pls help
Why did my ex unblock me on IG after three years?
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