Patti,
What do you see as your future as a crossdresser? If you believe you will be the kind of CD who dresses once in a while when your wife is out of town or you are on a business trip and that will be the extent of it, then this is a secret that can stay in place. But if you are the kind of crossdresser who seems to want to build a nice collection of clothing, wigs, shaping gear and accessories, all that keep the experience fresh, you may want to consider sharing. It appears that many of us here fall into the second group and one of the other characteristics is sometimes getting a little cranky if denied the opportunity. One way or another it seems crossdressing will impact a marriage. It's difficult to tell if that impact will be positive, negative or some kind of mix. I don't know any of us who can see the future, but you are going to have to be the one to examine where you are now and guess where you will be in six months, a year or five years. Based on that you will make the best choice.
I wish you good luck and clear sight into that crystal ball.