Facebook friend request help?

[William]

A few weeks ago I realized I had an extra friend on Facebook. I had no clue who this person was as they had no mutual friends. I said to him "Who are you" (by the way i hadn't accepted any friend requests from him) he replied "u don't know me but i am a really good hacker so if u delete me i will re-add myself and if u block me ill hack you and put weird statuses and tell ur friends stuff" I didnt believe him as it was highly unlikely he was telling the truth. I un-friended him but moments later got a notification saying " M*****W M****Y has confirmed your friend request" (I put stars for the name so no-one can send him stuff. I now believe he is a hacker and also me and my friends statuses keep changing to say "Check if a friend has deleted you: (and then a weird link to a fake site)" How can i get him off my Facebook? I'm pretty sure he is hacking but I don't know. Please tell me if he is!