answer: Mary is angry because she thinks #Person1# cheated her emotions. #Person1# explains that #Person1# regards her as the best friend.
documents: #Person1#: Mary, be calm.
  #Person2#: It is impossible. You cheated on me.
  #Person1#: No, listen to me. I always regard you as my best friend. I admire you, and of course you've helped me so much. I should thank you.
  #Person2#: Shut up!
  #Person1#: No, listen to me. Perhaps it's my fault that I treat everybody so well. Maybe in other people's eyes, I want you to be my girl-friend. but. . . but. . .
  #Person2#: But you have had lily already? You should have told me about her, but you didn't.
  #Person1#: OK. . . OK. . . Anyway. I will treat you as my best friend. I hope you can do the same.
  #Person2#: Leave me! Go away!