Often you cannot tell. Someone who is gay will tell you at some point if they come to terms with their sexuality--and if you have shown yourself to be someone they can trust with this knowledge.
tell him straight up
Straight up tell him.
If you are gay, just be completely honest with him. I am a straight guy, but I have a friend who is gay, so I do know this. Just tell him that you understand that he is straight, but that you have feelings for him and you wanted him to know because you felt that you needed to tell him.
Tell him straight out, have no regrets.
Well if they are straight then they don't like other guys. But you can tell if a guy likes another guy if they look at them like a straight guy would look at a chick.
You have to be straight forward, honest, and polite.
to see if a guy is checking you out look him straight i in the eyes and do a little grin.
Just tell them straight out, hopefully they will understand. Good luck!
unfortunately I don't think you can but if he likes you he is likely to be honest, && Not put himself first but to be honest you will know when he likes you.
ahh...tell him tell him...he mite go straight
You tell him straight out "NO!" If he doesn't like it, tell him to use it with someone else!
Just tell them straight forward. Otherwise you might miss your chance& regret not telling them