This is very common. My own SO was unable to answer some questions about why he does this, what is it that triggers the desire to dress on any particular day, where exactly does he see it going in the future, what informs his decisions to present a certain way, etc.
But, he does know some things: that he wants to lead a balanced life, he wants to continue to be engaged in his many other interests than the CDing, he is a genetic male and he has no wish to change this, and also he is heterosexual even though he has on occasion had homoerotic fantasies associated with the crossdressing.
Communication does not mean always providing exact answers to pointed questions. It is more about reassurance that the relationship or the couple's future is not threatened, no matter what that looks like. Different couples have different concerns and needs, and the importance is to find a meeting ground, wherever this may be.
Now ... if there is a husband who cannot tell his wife that he is not TS, he tells her that he thinks he wants to be a woman or he thinks he wants to have sex with men but he's not sure, then this takes it to an entirely different level and the couple needs to deal with it however they will. But, I'm guessing these situations are rare, compared to the sum total of marriages where a husband crossdresses. And also, a married CDer who is invested in his life and who wants to stay married to his wife will prioritize his needs (as long as he is not TS), and he will be able to also prioritize his long term goals, more easily than someone who is single and who does not risk losing a relationship. In other words, a happily married man will be more interested in finding ways to strike a balance than someone who doesn't need to because he is single.
This is my opinion, and obviously it is a broad statement to make.