We are assuming the issue is of a romantic nature between the sensei and his female student. Maybe that isn't the situation. What if the reason for the relationship is some thing else? What ever the reason theiwr is a core dynamic between men and women. The female student should not take the actions of the sensei personally as explained in the book WHAT YOU NEED TO KNOW ABOUT HOW MEN THINK AT WORK - FOR WOMEN ONLY IN THE WORK PLACE by Shaunti Feldhahn. This could help.