I did let it slip once to a co-worker.
I had worked with her for almost 6 years at that point and we were both pretty upfront with each other about other things that were going on in our lives. She had let me in on the details of her past because it kind of mirrored what was going on with my wife. I had contemplated telling her on occasions before but could never just bring myself to blurt it out. Then about 5 years ago I was super stressed out while my wife was in the hospital and it just kinda ended up coming out. I was freaked but she handled it like a true friend and just told me "Everyone deserves to be pretty"
After that, she was great at giving me advice and was super helpful. It turned out OK but the same can not be said for all situations. I would tread with caution.
Cynthia