I told my wife 4 months before we got married, and the initial reaction was not good. It almost broke us up. As she explains herself now, at the time she said that she had an "ideal" image of a husband in her mind, and crossdressing wasn't a part of that ideal. So when I told her, she didn't know how to handle it. Then there was the other element of me keeping a secret from her for so long (we dated for almost 7 years by the time I told her). She also had worries that a lot women in the same situation have... Is he gay? Is he going to want to live full time as a woman? Etc..
Don't say that you're going to stop dressing. This may be a temporary fix, but is not good in the long run. The desire to dress will return. You'll probably end up doing it secretly behind her back, or even start resenting her for making you suppress that side of you.
I've come to accept that CDing is a part of me and makes me who I am as a person. My wife has also realized this as well. This is one of the many reasons that I believe we are truly meant to be together. We have now been married 6 years and she is fully accepting of Danielle. But reaching this point definitely didn't happen overnight. Give your GF some time to process her feelings about it. Communication is key. Things may get better over time. If not then, it's sad to say, but maybe you weren't meant to be together. I wish the best of luck to you though!
