Why would you unblock an ex?

Well just seen on Facebook an ex came up as suggested friends. We haven't spoke in over a year and he blocked me. So I don't get why now. Not even like it was a civil
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For those saying he's moved on. I really hope so. More from a scared aspect why he's doing it considering before we stopped speaking he was keeping my hair, cheating on his girlfriend with randoms then blaming me for her to kick off at me and ringing me a lot paranoid people following him
Why would you unblock an ex?
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