see.....
if this guy is young, its easy to sense , no?
they have plenty of time to spend with u, no?
from those time u spend with him, u should be able to notice if he likes u

but if he is into career/business, then its hard to sense
bcoz he will be busy with his work and cannot show u love all the time
so u need to make sure you dont miss this good chance

why dont you go and express your heart to him, in indirect way
"i like a man, he has a chubby cheek, i love his spike hair(if he doesnt hav chubby cheek and spike hair then u replace the word with what he has), his warm and charming smile.. he is very close to me
i think he care about me, but i am not sure wheter he care about me or not. Do you think he care about me?
What do you think a guy will do if he likes a girl?"

Then he will think for a second, and try to tell you the most common thing a guy should do.
(Some guy maybe been trying to think how he should tell it, and took too long to think =.=
so this way, u are actually forcing his brain to think a good way...)
Ok, so once he spill it out.. you go and tell him... Yeah, that should be a good way to express feeling to girl, i would love
a guy to express like that to me.

wait for a few days, he might express he likes you if he really likes you

sorry, i am too drunk and im still writing. haha dont ban me for my idiotic comment.