Why won't my girlfriend travel with me?

We've been dating for 18 months and living together for 6 months. Whenever I bring up someplace I want to go on vacation, it causes stress and arguments. She says, "I just don't like to travel like you do." I tell her that I'm willing to pay for everything and make any concessions to the travel arrangements. She avoids giving a direct answer and says, "no" when pushed.

Is there a way to overcome this "travel anxiety" or is there another reason?
Why won't my girlfriend travel with me?
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