How do you ? If you fancy him flirt with him a bit, he shouldn't need much more encouragement if he is intrested, if you like him as a person but don't want anything physical tell him that he makes you laugh or that you love your chats, then drop in something like he reminds you of your brother
How do you ? If you are a girl next time they make you smile say "Awah I really like you! " and then carry on the convo like it isn't a big deal?! Something like that?
How do you ? Us guys are simple as....nowhere near as compicated as you women. Just pay a compliment and that's it you've broken the ice, will take a real a**hole to take the p*ss