Dr. Strange & Bruce
At least Bruce knew. If Christine said anything to the other man, Bruce might let him know. After disclosing the suspicions in the hotel room, Christine might be reluctant to. Or at least, Stephen hoped Bruce would do that. Nevertheless, it was left unspoken. He would mull it over later.
"Yes, the Chitauri attack happened. This universe didn't exist until sometime after two thousand sixteen or seventeen." The change of topic was a welcome diversion from wondering what her parents were up to, and this was an ongoing mystical anomaly that Stephen studied constantly. There would be a book to add to the library of Kamar-taj, once completed. "No one was ever aware that the Dark Dimension nearly consumed this world. I turned time back enough to repair the damages to a Sanctum and stop the incursion. Unfortunately, this was the side effect. It's also possible there's a universe where I failed to stop what happened, and we're all dead because of it."