Thanks so much for your reply. I am still really conflicted about what to do. Your reasoning makes a lot of sense; and I have been worried that approaching him about this would be more about me; it is my desire to know what happened and share the burden together versus his desire to keep it in the past because maybe now it's now a non-issue to him or he doesn't want to share for any other myriad of reasons.

My concern is that is hasn't shared because he thinks I would reject him. I don't want him to feel that way because I would never do that to him. I also firmly believe that there should be no secrets between a husband and wife, husband and husband, wife and wife, etc. But, is that a selfish line of thinking? (I am not being sarcastic, I am genuinely interested in what you think of my thought process).

I do understand what you are saying in regard to it being selfish to put him in a shitty situation he wasn't prepared for. What if I ask him what post he was telling me about that he commented on because I wanted to go read it, too? It would give him a chance to delete his response if he genuinely did not want me to see it. If he told me where to find the post he commented on, and then left his response for me to see, would that be a situation in which I could talk to him about it?

I am still unsure if him telling me he was commenting on a specific post in a specific sub, knowing I know his screenname, and that we frequently share posts with each other was a way for him to break the ice on the subject, or if I'm just reading into it too much and he didn't anticipate I would see it. But your response leads me to believe the latter of the two.