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If you're worried about coming across as spiteful and immature, just click on 'Following' on his FB profile so you stop receiving status updates. But you can just remove him, and send him a calm, respectful message explaining why, just to give yourself space, etc. and then possibly re-add him when you've moved on if you feel like it, and if he feels like accepting the request. But I wouldn't recommend BLOCKING. That is kind of petty, in my opinion. Hope this helps.