Why would an ex block you on face book?

my ex split up with me 6 months ago. we had been together for a year and been close friends prior to that.
Anyways for the last 6 months there's been very little contact however we were still friends on facebook until the other day when he out of the blue blocked me -and I have no idea for what reason? anyone have any ideas?
Why would an ex block you on face book?
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