Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?
This is your opportunity to ask questions. No question too simple or too silly.
Culture war topics are accepted, and proposals for a better intro post are appreciated.

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Notes -
I wouldn't be quite that harsh on yourself. Some aspects of a person they're set on keeping to themselves might well be your business: say a friend or family member doing dangerous drugs, and you find out through an oblique route. It's a bit tenuous to connect that to sexuality as an analogy, but I hope you get my drift. You have every right to feel some level of dissatisfaction, and I wouldn't hold it against you if you did ask him outright. Just being gay, is as far as I'm concerned, totally fine. A marriage of convenience (potentially one-sided convenience) changes the calculus somewhat. I can't blame you if you intervened on behalf of his wife and kids, though I'm not sure there's even a reason to intervene, and what you really want is to have him just tell you the truth and explain why he kept it from your his entire life.
If his wife is okay, and the kids are happy, then it does make sense to not rock the boat. Then again, she might be deeply embarrassed and unwilling to speak out because she fears the social and personal consequences. She wouldn't be the first person to stick around in an unhappy/lukewarm marriage for pragmatic reasons. (I am absolutely not bold enough to claim this is the case, I don't know any of the people involved!)
On the other hand, simply politely telling him you found out and you're disappointed by the charade is not, as far as I can gauge, a bad thing to do. And I suspect that is all you consider doing.
I'm lucky that even during my worst bouts of depression, it never went from passive/intrusive thoughts to active suicidal ideation or planning. But if it had, you bet that I would have fought hard to remind myself that I would be sorely missed by my family and other loved ones. I hope nobody in the stories we've shared has reached that point.
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