I was visiting an out of town support group once upon a time, long ago and when I mentioned I didn't plan to come out to my wife I was greeted with pretty much universal amusement. They all seemed to agree that it wasn't "IF" she finds out, it would be "WHEN" she finds out. I scoffed at the suggestion that my skills in hiding and timing my dressing interests were not up to the task. It took about 4 more years, but she found out. Now I'm with the group saying how unlikely it is that anyone with a significant interest and draw to crossdressing will be able to hide it from a spouse for ever.
You may not be ready for it now, but it's good to think about it and consider how you will respond when that moment arrives. Being prepared mentally and emotionally may help guide the revelation to a much better resolution.