Is it normal for Europeans to not travel to other European countries?

My aunt from Vietnam married a French man and has been living in France with him for 6 years now. The only European countries she's been to are France (of course), Germany, and Switzerland. As a non-European, I've been to more European countries than her (Italy, Germany, Belgium, England, etc.). Is it that Europeans dislike other Europeans, or that her husband just isn't into travelling? She does not have a driver's license (in Vietnam, she's used to driving motorbikes, rather than cars), so he has to be the one to drive her. Or they can just travel by plane or train.

Is it normal for Europeans to not travel to other European countries?
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