My ex unblocked me from fb

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My ex and I have been broken up for like two or three years or something and we were like high school sweethearts, whatever... but here recently, he's unblocked and then blocked me again from facebook? He has a new gf and has moved on. I see them all the time and she totally despises me haha but i haven't spoke to him since my birthday march '12. I just don't get it... Help me out!!!