If she took Po as her husband, she would be making promises about a future she couldn't yet see. For once she became his wife, she would be his forever. And, no matter how much freedom Po gave her, she would always know that it was a gift. Her freedom would be not be her own; it would be Po's to give or to withhold. That he never would withhold it made no difference. If it did not come from her, it was not really hers.