Men like to have things spelled out for them and often don't catch up on subtlety. So if you think you've told him but you haven't verbally said, "I like you", then you haven't told him. The best way is to be direct and upfront.
tell him you like but when your alone
It's not the best way to tell the guy that way, but lots of people do that everyday believe it or not.
you should just ease into it
Tell him / her that you like him/her..simple!! Trust me, this is the only honest way.
the way he acts around her . and if he acts really funny around her
"I like you"
The best way to tell if a guy likes you as more than a little sister is to just ask him!
The best way is just to tell them. Or like ask him to guess who you like and if he guesses himself say yes! The worst thing he can say is i dont like you. There are other guys!
just tell him that you like him. show him your feelings why you like him or show some indication that you like him. WARNING: telling a guy you like him and he doesn't like you can be incredibly embarrassing for you, especially if you're surrounded by others when you tell him, or if he's a bit of a dick and tells everyone that he blew you off
this is what my friend does tell the to look you in the eye and say he doesn't like you with a straight face if they laugh they like you try it
The best way to get a guy to notice that you are flirting with him is to be direct. If subtle hints are not working, just come right out and tell the guy that you like spending time with him and would like to do so more often.
The best way to tell him is just to tell it to his face, but It may seem very hard, it's the best thing to do.
It would usually be best to tell the guy that likes you sorry but I am not interested. Say it in a nice way and you should be alright.