Without getting to much into your personal business, Im curious, does this guy say anything or is he just sort of lurking around silently? Me, I like the brooding poet type but if he was constantly talking I can see how that would be annoying. Im kidding of course, but in all seriousness, if he is saying crazy things to you, then you of course should keep a detailed chat log you may well need it, and if you were to mute him he would be just a harmless grey blob following you around... Admittedly sort of like a creepy shadow. Oh! and there is all of those SL police people..I dont really know what they do but maybe they could show up and bump him around or something?