Clare's Father to St. Francis

In the 1970's there was a great movie of the young Francis of  Assisi. Some of it was questionable history, but who knows all that happened. The movie portrays a romantic interest between him and Clare. So here let us imagine a conversation between Clare's Father and Francis of Assisi.

Francis "Father, I love Clare and I will not marry her, I am going to be a monk."

Father: "No, she shall not be a nun. You are not betrothed to my daughter."

If the father said that for the man and the virgin (nun) that should have been the end of the matter according to the Scriptures including I Cor. 7:36.