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Well, it was a break up after all and you can't just turn feelings off just like that. He could be experiencing a whole range of different emotions at the moment (in fact, he will be) anything from anger, sadness, guilt, rejection, numbness... pretty much all of these. He will likely be missing you/thinking about you, it's so hard to shun someone from your mind like that. He could also be a little nosey, or not quite ready to fully let go of you yet.
Only reason I'm saying these things is because I went through a bad break up a few months ago. Only difference was, I was the one doing the un friending and blocking. My ex was just rubbish at dealing with his emotions. Either way, after having experienced all of his anger and hurt, we seem to miraculously be on the mend now :S