I imagine there are lots of things I haven't shared but they're primarily because they didn't come up in a conversation. Sometimes I'll say something and she'll say: "You never told me about that...etc"
However she understands that it wasn't like it was some sort of "secret" but rather there was no reason to bring it up or there wasn't some (trigger) that would have caused me to recall it.
Once one gets beyond a certain age sometimes you surprise yourself by recalling a past incident or experience in your own life! :)