She had listened and watched, feeling rather like a strange third wheel as Megan tore into Stan. She wanted to grab her and yell at the other girl, tell her that she was being selfish and how miserable Stan had been. That the kiss at first really didn't mean anything.
But she didn't, because it was quite clear Jones wouldn't want to hear a word that came out of Millicents mouth. So when she left she let Stan hug her, wrapping an arm around him to return the hug so that he could hopefully know she was staying quite put until he moved.