I need advice.

This may sound a bit weird, but you might write him a longhand note on nice notepaper expressing that you want him to be happy, feel loved, be accepting of who his is, that you're there for him always, and whatever else you want to say. My mom sometimes did that for me and my three brothers when it was a difficult, sensitive subject. We only occasionally followed up with a discussion with her, and when we did it was great. But it was wonderful just knowing that she was open to talking about anything, any time, without prejudice. Most importantly, don't pressure him. He'll talk to you when he's ready.