I am going to have to respectfully disagree with you here.
I will say that I have been in multiple relationships where diapers were part of the mix, and several that diapers were kept out of the picture. As I got to know each of them I had a good idea who might be more open to the introduction of wearing and using. In those cases I eventually brought it up, and generally it worked out quite nicely.
In some cases however, I was really quite adamant it was not something I should bring up. One of them would always lock herself away in the restroom even just to pee, and was quite shy in general with kinky stuff. I was convinced, and still am, that sharing the desire to wear and use, and ideally have her do so, would have sent her running. I therefore never mentioned it. I would wear occasionally, when alone, and stored them away safely. To my knowledge she never had any idea. We had a wonderful relationship regardless, and perhaps would've taken it all the way to a church if she hadn't been offered the career of a lifetime in a horrendous country...
So yeah, I guess I am trying to say - in my opinion, I don't think we do have to share our inner deepest secrets in order to have a truly wonderful relationship. As long as you can put these kinks on ice, when necessary and not let them hinder joy and happiness in your relationship.
Take care
A.