How do I best support my son?

Hi all! I wasn’t sure where to post this so I thought asking people who may have been on the other side of this situation may be the most helpful.I recently came across some social media posts that would indicate that my teenage son is gay. I wasn’t snooping as it’s an open forum and he often tells me about things he posts, but he may likely be embarrassed if he found out that I came across it.I will say that I was a bit surprised (he’s had girlfriends and seems to talk about girls with his friends). I went through a range of thoughts throughout the days following finding the posts. Aside from the selfish “ah man, grandkids!” And “why hasn’t he told me?” Which I’ve worked through, I’ve done a lot of cringing at how often I’ve mentioned future girlfriends, getting married, kids, etc in talking to him about who he wants to be when he’s grown up - like it’s a given already that he’d be straight.My kid is awesome. He’s well liked, sweet, giving, helpful, hilarious, active in the community and sports, and overall a well rounded good dude.I guess what I’d like to know is how to I proceed in a way that lets him know that I could care less who he decides to love in his life and I support him no matter what, all while not letting it slip that I know something that he’s obviously not ready to tell me about yet? I’d first considered mentioning that I’d seen the post but I don’t want him to close up or be embarrassed and I do value his privacy and choices on on the matter and want to make sure he knows that.I appreciate any and all advice!