Damon was surprised and also relieved that Ashley took in everything he had told her softly. The talk actually went on better than he had expected. He had no idea that she would be getting to know all this so soon.
He couldn't tell her more because he had seen the way she felt, even though he couldn't know what she was thinking. That was too much for any human being to just know. Well, maybe not too much for her, she had already seen it before he told her, Damon thought seeing it would be more frightening for them than just hearing it.
It could even be hard to believe and hilarious to just hear that demons were on earth unless one sees it for himself. That would also explain why Ashley believed it after he told her. She should have maybe burst out laughing at the talk but she had become pale and looked like she was going to throw up any minute.
