tell him that you don't feel the same way as he does about you. except do it in real life, not over text or calling! but if you want to, tell him you can still be friends!

Hmmm hard. I'd probably say to be nice about it(don't text him). Tell him you don't like him in that way and you just want to be friends.

advice for later- if you like someone but your friends don't, so what? lol. advice for now- tell him face to face you don't feel the same way but you still want to be friends. invite him out to do something as friends maybe.