Where did I go wrong?

So this guy I have been with for 5 years has ended everything, the only reason being is that he wants his own 'space'. I dont understand his reasoning, I was never the girlfriend to be clingy, he never had to ask me if he was able to do anything because we didn't work that way, I trusted him. He had his space, I would only really see him on a weekend. Obviously I started to wonder if it was me, was I the issue? I asked him what I did wrong and he said nothing, he adores me still and thinks the world of me still etc. But that's so difficult to believe, I just don't understand where I went wrong? Our relationship was long, I can't imagine life without him and even though we have tried going separate ways before, we've always came back together, this time is different though, he's blocked me on everything to help me move on. I just don't understand, if he still adores me and all of this then why is it so easy for him to walk away?
Where did I go wrong?
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