After Nicole left Ian in her room he was confused for a while, he didn't understand what he had done wrong. Why was she so mad? He was doing everything he could to make himself acceptable to her family so that they could finally be together.
He was in a trance for a good ten minutes before he finally realized that all his efforts didn't matter if Nicole left him. He loved Nicole, he had never been with anyone before Nicole and he didn't think he could be with anyone else. To him Nicole was it, Nicole was the woman he wanted to spend the rest of his life with, the woman he wanted to build a family with, the woman he wanted in his future, without her he had no future.
Ian rushed down in the hopes that she was just in the living room, when he found it empty he asked a maid where their mistress had gone. The maid told him that she had taken her pink sports car and driven away.