The only way to know is to ask him.
My suggestion is to find out if he is gay first. Then get the courage to get to know him and things will follow.
You know that your gay when you kiss a man have any sexual relationship or really like a guy. im gay & im proud of it.
you a guy is guy when he doesn't like girls and wants to marry a boy
touch his booty and let him know you like him and his booty
Guy: Hi!You: i'm gay.
Kiss him.
Girls can tell or know if a guy is gay by observing his behavior in a group of men.
The only way to know is to ask him.
Be friends with him.
are you a guy or girl? if you a guy and you have a guy on your mind your gay and if its a girl you like her. if your a girl vise-versa
follow your heart and be gay like you want ur a true gay guy trust me i know 2 gay guys their the best friend i ever had