Ron wanted her to be a  better wife, one who didn't work, or at least worked less. It was their most recurring fight. Hermione had realised that her marriage was teetering on an edge and it would tip one way or the other at this point. They had been married for five years... And she was thirty. No children, but her plan had children appearing at thirty-five. She was Head of Department for Magical Creatures and in the process of transferring to the Department of Magical Law to be Deputy's Head, well on her way to becoming the youngest Minister for Magic, exactly on time with her plan. But Ronald didn't want to wait anymore and he didn't want her to be Minister, even though he had known and agreed to the plan before their marriage. He later confessed that he had only agreed because he thought he would be able to change her mind once married... 