I'm sharing this to see if anyone else feels the same and to perhaps warn others. I am married and my wife has always know about my crossdressing. She is very accepting in many ways but does not want to see me dressed. She is extremely afraid of others finding out so going out shopping with her is not an option. About two years ago I was desperate to have a "girlfriend" I could have girl talk with so I confided in a female friend that I have coffee with on a regular basis. She was very accepting and has never had any issues talking with me about clothes, makeup, etc.
Now for the unexpected result. Although it's great to have someone to talk to you, I almost immediately had a sense of dread when it hit me that someone else now had the power to out me. I have no reason to believe she ever would but now I worry about her accidentally saying something to my wife, telling one of her close friends, or if for some reason we have a falling out and she decides to out me.
So now, two years later, I feel like I actually added to the weight of carrying the secret of my crossdressing. My advice is, before you share your secret, be sure you can accept all of the potential consequences.