Only one way to find out. Ask.
1. Does he look gay ? If not, refer to 2.
2. Try making a joke about it and see the reaction. "So, is there a girl you're interested in ? Or a guy ? :p "
how does one look fucking gay it is a sexuality not a dress idiot
I don't think you should directly ask him, in case he might be extremely homophobic. Maybe ask him on his views on gay people first. If it's positive, then ask him.
You don't seem to have seen many gays in your life. Sure, it doesn't show for everyone, but it's obvious for some of them. Think a little bit more before calling people idiots. '^'
Okay so first if all let's get the basics. I am a 15 year old boy and I'm gay. Okay so there's this REALLY hot boy I know and he's always like touchy and nice and smiley around me. IS HE GAY????? IS HE???