It is bad to look through someone else's things.
Tom's mother Susan suspects that he has been dating a girl without telling her about it.
Susan wants to find out if Tom has a girlfriend.
Susan sits down with Tom and asks him if he is seeing anyone.
Susan goes into Tom's room and reads his journal to see if he has written about a girlfriend.
Tom tells his mother that he has been dating someone, and he feels relieved.
Tom discovers that Susan went through his journal and feels upset and violated.