My 'ex' still finds me on everything?

This guy never wanted a real relationship with me. But we were no strings attached for like 5 years (we were teenagers so no actually sex). I ended it 4 years ago (when i was 21 now 25). But I still see from time to time he still views my profile? I blocked him on everything but LinkedIn. And i would continually block him, on everything.

I really feel like I'm done with this person because he wasn't really the nicest to me. But he'll message me from time to time and i just end up blocking him.

Why does this person want to view my stuff? Four years is a long time.
My 'ex' still finds me on everything?
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