How can I get this guy to leave me alone?

[Kimberly D Witte]

At first me and this guy were friends, but he has become so annoying. All he ever talks about it this girl Amanda. She's not even his girlfriend or anything. I don't believe she's even a real person. He runs "her" Facebook account. She supposedly has two adopted children, spends most of her time high or drunk, goes to college, and murders people on a weekly basis. "She" recently killed a whole family because someone murdered "her sister." "She" loves getting into fights. I think if this girl was real, there would be stuff on the news looking for her or something. Plus, he's always making remarks about my religion. He WONT leave me alone and let me concentrate on my art. I've dealt with it for so long and I'm tired of it.

How can I get him to leave me alone?