Will he ever know?

Look, clean up the [slang] language first & you may be able to get somewhere with dis.. It appears you are referring to dis friend of your who you think is **, not gay.. Last we looked in de dictionary, gay means happy. A ** will always be [a] ** & you don't want to be hanging with one o' dem jack..

If you have been friends with him your whole life and you're not sure what his sexual orientation is, I say, you still don't know him that well. Get him to speak about what his thoughts are-about himself :)

He probably has some idea who he's attracted to. He could also be asexual. It's a matter of will he ever act on it or live his life openly. Guess that's for him to decide. He's your friend either way. Does it matter?