Because she became her last introvert self who was cowardly afraid of people like that. Moreover, since she couldn't remember him, when he forced on her, naturally she felt assulted. An introvert at that.
Well, this overbearing Kuro needs to learn how to cherish her without being overbearing
Lesson learned: furniture are more handsome than men ε=ε=(ノ≧∇≦)ノ