I have also experienced this - truly. I really didn't know when she asked me. I just told her that I'd keep exploring, contemplating, etc. It was highly emotional and we did decide to divorce. It's still emotional for both of us as we remain close, but as BFFs, not a marriage partners.
I'm afraid that for you this is one of those rare times when you need to seriously consider how important it is for you to find your authenticity and live it... or not. Of course only you can answer that. It may well upend your wife's world and yours, that's a fact.
It's almost two years since I drove north from the Bay Area away from my wife and our home. At the time I really didn't know where I'd end up. As it is now, I legally changed my name and gender (surprised but I was compelled due to Trump's threats), started HRT (as an experiment at first, but I liked it much more than I expected), discarded all of my male clothing, came out to everyone I know, had GCS and breast augmentation surgeries, and am scheduled for facial surgery in one month. Honestly, I had no idea I'd do all this, need to do any of it. I've reached a decision point, thought about it, weighed it, made the decision, and then encountered the next decision point and repeated my process.
I'm happier but I miss my life partner, flaws and all. I'm lucky that we stay in touch but she's 1,000 miles away...