Deffense, almost similar thing happened or is happening to me and the matter is that I'm away from her, traveled fro work. Maybe there is no love in your case.
As they said, you can dance with her or watch her dancing while you'll be on fire.
If you're dating just to go out with her it's something else. If you don't like to dance and feel you can't support watching her dancing than better leave her.
If love is between, than it's how much you trust your love together.
And I'll tell you that to dance you should live it and feel it not just making steps with your partner, I can use the word "to be in harmony".
Good luck.