You can't "like someone who likes you but you don't like him." You either like him or you don't. You need to figure out if you DO like him, or if you DON'T like him.
If you DO, then go for it. If you DON'T, be honest with him about it and don't lead him on.
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.