"The Perfect Girlfriend" by Karen Hamilton.
The main character, Juliette, is obsessed with her boyfriend and will go to any lengths to keep him interested in her. That means anything, no matter what it entitles.
She is one twisted person; after reading this book anyone would be afraid to start a relationship. I had to keep reading to see what would happen next. 4 stars out of 5.
"The more I learn about people, the more I like my dog."
Mark Twain