This is why I wouldn't hide it and instead, I am open with it. Did you even read the thread?
Yes. I did read this thread twice as a matter of fact. And yes, I assumed that she would be aware of your sole side property. And perhaps, as an aspiring wife who truly want to love her husband, she would not mind it initially just because she wanted to be a GOOD and GIVING wife. But sometimes it takes a lot of time to discover and COMPREHEND some essential details and real intensions of other person, especially as initial love feeling is gone, rose colored glasses are cracked and we discover other people quite annoying shortcomings. It is inevitable. Questions start being asked. And in this case she realizes that your actions were FEAR driven. Then they tend to overthink, perhaps make things up and rush into conclusions. And domino blocks are falling.
I love motorcycle riding analogies. The biggest enemy preventing to truly enjoy riding bikes is the same FEAR of crashing and losing either health or live. Both riding motorcycles and being married is by definition risky. Bad things can happen. Usually, the fear is the worst advisor here and often leads to tragic consequences. Both women and bikes hate the fear of the pilot.
I am not criticizing you here. In fact, I am quite empathetic to your dilemma. You want to retain somehow a leader position. I am not judgmental towards you at all. But at the same time I cannot escape a conclusion that you seem to be confused how to get your point across.
I am not a layer, but if you WANT that sole property, just setup a trust or some kind of rental LLC who would be the owner (I am sure there are ways of doing so), make sure it goes to your wife in case you die before her and never bring it up. Not because you want to manage the potential divorce situation (fear driven) but because you WANT things be that way (strong will driven).
I am married for 25+ years and let me tell you, my wife totally hates if I hint any kind of fear or hesitation on my part managing my stuff. And I am totally grateful of that on her part, because she makes me stronger that way.