Aiden Hawk was in a mood, and it had nothing to do with anyone else but his own wife. His plan, to seduce her and make her fall in love before her memory returned, was falling apart. He'd confessed to liking her and what reaction did she have? She thought he was sick and probably delusional, which was not good considering the fact that her memory or figments of it had started to return. She needed to believe that he had fallen for her. Only then she would love him back.
What was the problem then? She was attracted to him physically. He could see that in the way she looked at him and responded to his touch. He'd also managed to change his first impression in front of her, showing her how caring he was instead of the cold 'ice man' she assumed him to be. So, she definitely liked him. But then, why didn't she say so?