You can not tell if someone is gay. The only way to know for sure is if they tell you.
If he is your friend, ask him. If he hasn't bothered you with it, it shouldn't matter to you if he is. You can't catch it, he was born that way. If he is your friend, tell him it doesn't matter to you one way or the other.
If you are also gay, then tell your friend. If you are the opposite gender, then move on.
You can not tell if someone is gay by wrestling with them. The only way to know for sure is if they would choose to tell you they are gay. It should not matter anyway, especially if they are your friend, you should accept them for who they are.
My question, is your friend out? Does he/she tell everyone that he/she is gay? If not, then telling people that your best friend is gay isn't something you should do. Besides, what difference does it make? Does it really matter whether they know or not? Do these people ask if your friend is gay or you wanting to volunteer the information? If this person is truly your "bestest" friend, then whether gay, straight, or bi, it shouldn't matter. Other people don't need to know. If your friend is okay with them knowing then telling them shouldn't be a problem. I personally wouldn't just go around telling everyone my best friend is gay, not that I would be embarrassed, but being over flamboyant about it may be a bit much. My next question is, "Why would you even care or want to tell them?" If it were to come up in conversation and they ask, then I can understand, and if that is what you are referring to then just tell them, this person is supposed to be your best friend and you shouldn't care what others think. If you are just wanting to go around telling them your have a gay best friend, think about WHY, before you do that.
if it is a boy he is gay but worry tell your other friend
Tell him you are uncomfortable with that.
you ask him.
If you become friends with a gay guy, you have made another friend. Whether your gay friend would like you depends on how he feels about you. You may or may not be his type.
Ask him
If you are gay, no if not Yes
Sometimes it is best to just ask out straight. You could tell him you have these feelings and see if he responds first. He may just enjoy your company without thinking on the gay side. Does he know you are gay? this would be a starting point.
flirt with her then be bestfriends, then tell her!... to be her best friend act gay! ahha jk