It did not change then. [In fact, things had only gone, well, romantic, after that. She might be blushing a little bit as she thinks back to those memories.]
It did not even change after later that night, when he had needed blood and I offered him mine. He warned me to be cautious around him, but he continued to see me. However, at the prom, I spoke to the one who had changed him, and I saw that she had confronted him as well. I do not know what had happened, but the next time we spoke, he told me not to contact him again.