As for what you knew Magnus always had feelings for Marion but as for her she chose his brother Jake.Another this is that Magnus is a vampire,Marion needs his help to cure Jack's illness. You on the other hand knew all this from overhearing conversation and because Marion used to be your classmate,she was a nice girl after all,tho you could understand that Magnus was going through pain because of her choosing his brother.Today you were walking home while reading a but from the book you just bought when you bump into someone.