I have LOVED all of Kasie West's previous books, but unfortunately, The Fill-in Boyfriend isn't one of her best. The characters and the way they handled situations felt very immature and shallow. I know the story is supposed to be about Gia finding herself and growing up, but then it felt like they were all back to their games at the end of the book. Way too many petty scenes of people trying to make other people jealous. 
 I love escaping into some YA light and don't necessarily need a lot of depth in the novels I read, but this was like kiddie-pool deep. 
 Kasie West and her books are awesome, but read On the Fence or The Distance Between Us instead.