Hate List by Jennifer Brown

Valerie, a school-outcast, finds herself in a tough situation when her boyfriend decides to shoot up the school. For years, Valerie and Nick have been creating a 'hate list' of people who have bullied them, laughed at them, or annoyed them.  Valerie thought they were just blowing off some steam.  But when a bully breaks some of Valerie's personal property, she sends Nick after the bully to make her pay.  Valerie just didn't know what price that would be.  When Nick starts picking people off the list to shoot, Valerie throws herself in front of the boy she loves--only to get shot herself.  This is a story of a girl trying to come to terms with her role in the high school shooting.  Her parents distrust her, she has no friends and she desperately misses the boy she loved, the one who decided to start 'checking things' off the list.