For some people, the thoughts do fade and never come back. For others, they never do, and they embrace it as a part of their every day lives. And then on the spectrum in between, for many of us our desire to crossdress comes and goes; it can lie dormant for awhile, and then come back, and go away again, and come back again.
If you know that the urge comes and goes, maybe you should keep it private. I don't think you can simply rid yourself of the desire to crossdress; you want what you want. But even if you could, I wouldn't. Like the others have said, the more important thing to do is learn that crossdressing isn't something to be ashamed of.
