A Secret from My Past Life

I've been married for eight years now, and while I love my life with my wife, there's this one thing that I keep hidden. Before transitioning, when I was still living as a man, I had a relationship that involved BDSM play. It wasn't about pain or dominance in the traditional sense, it was more about trust and control, exploring who held power during intimate moments. Since transition, I've never discussed this side of me with anyone, not even my wife. The idea of opening up to her scares me because it might change how she views our relationship. I wonder if there are other trans individuals out there in marriages who also have kept parts of their pre-transition selves secret from their partners. Do you think it's worth risking the security and happiness of a long-term relationship just to be completely honest about your past? Or is it better to keep certain aspects private, especially when they don't impact the current dynamics?