does your school have a written policy on affairs?

I'm not an educator . I am a director of student services who has been given a problem. I have a student who has had a relationship with the administrator. She now complains that he had undue influence on her position in the program and she felt pressure from him (they lived togethr for awhile). The head of the school tells me that I can not regulate what he does after school hours (I wanted to make a requirement, no contact with students outside class) as this is his private time and of course all the statements, emails and text messages he sent to her he says are after school hours.

This no policy about private after school time seems wrong. Does your school have a written policy on contact between, administration, teacher and student? I'm begining to feel like my school is behind a half century in sexual hassasment rules. Thanks