Relationship Advice???? I need reasons not to date a guy?

So there's a guy that likes me and is going to ask me out but I don't like him in that way and he thinks I like him because I told his best friend that I did (I know I shouldn't have my sister told me to, it was stupid yeah) so he thinks I like him so I can't really tell him that I don't. I also can't use any other excuses because he's really persistent, so I don't know what to do. Please help me. Thank you in advance :)

Anonymous2015-11-23T10:02:42Z

Just politely turn him down, saying you were mistaken, that you just like him "as a friend."