Help do i risk it?

I have a best friend and we have been good friends for two years. he recently broke up with his girlfriend 2 months ago and since then we have been hanging out more often. I really fancy him and I don't know whether to say anything? I'd be devastated if I lost him as a friend. I've tried putting X's at the end of texts which he does return but only if I put one first.

here is a screen shot of our message should I respond like that or leave it?

when we are together it is never anything but friendly no flirting but then I also know he is quite reserved and shy. Like at the cinema today we were totally separate in out seats. i just can't tell if he feels the same way or not. any advice would be great!