There is no way to tell for sure if a guy is gay. There are stereotypical signs that people consider tell tale signs that a guy is gay, but they're not always true. The only way to know for sure is to ask them. They may or may not be comfortable telling people if they're gay.
Guy: Hi!You: i'm gay.
You can tell that some guy is gay by asking him his best friends, and by observing his behavior about other men.
Ask him
Sometimes you really can't tell. I mean he can be a nice guy that likes to look good. If your not sure get to know him and look for signs that shows he is.
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.
Girls can tell or know if a guy is gay by observing his behavior in a group of men.
Tell him a joke.
It's basically the same process as a boy and a girl,there is no difference
Oh, my friend, there's no need to look for signs or labels. Love is a beautiful spectrum, and it's okay to be yourself. Just be kind, be true to who you are, and surround yourself with those who appreciate and support you.
just write a note
Ask him