Why did my ex unblock me on Facebook?

Anonymous
So after a bit of drama, which happened after I was already blocked on Facebook, my ex and I decided not to be friends, and to move on with our own lives. However, by chance, (as in I was creeping another friend when I found this) I noticed that he had unblocked me on Facebook. I'm confused as to why he would unblock me when he flat out told me that he wanted me to leave him alone, and he blocked me to force me to leave him alone. We had a bit of a messy breakup, and didn't stop talking for a long time after the breakup (two months to be exact), which is when he blocked me. The drama started two weeks after he blocked me and that's when he and I talked and he told me that he wanted me to leave him alone. ANYWAY, I'm just wondering what would cause him to unblock me if he wanted me to leave him alone?
Why did my ex unblock me on Facebook?
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