The Unwritten Rule, by Elizabeth Scott

Brianna is the girl everyone wants to be or be with, and Sara is her best friend. Sara is perfectly fine with living in Brianna's shadow, even though Brianna's new boyfriend is Ryan, Sara's crush. Though Sara tries really hard not to like Ryan, everything gets way worse when they kiss one night after a party. Sara, who has never been anything but loyal to Brianna, is wracked with guilt for what she did and what she wants, but can't help herself from getting closer to Ryan. Yes, it's another one of these stories, but this one is pretty good.

I've read these stories before, and chances are if you're reading this review that you have too. There was no unique twist that made this one completely different from any other book like it, unless you count Sara's selflessness, which I don't since it wasn't important enough to make this book stand out from the other "I'm in love with my best friend's boyfriend" books. However, this book was written well and it really showed all sides of the story well. Somehow I didn't hate Sara, Brianna, or Ryan when I finished the book because Scott managed to show each character perfectly. Brianna was just mean enough that you cheer Sara and Ryan on, but just pitiable enough that you don't consider her a horrible person. I suppose Ryan would be the one to blame but I felt like he was a victim just as much as the other two were.

4.0 stars. Not out-of-this-world incredible, but definitely enjoyable.

 
Everyone knows the unwritten rule: You don’t like your best friend’s boyfriend.

Sarah has had a crush on Ryan for years. He’s easy to talk to, supersmart, and totally gets her. Lately it even seems like he’s paying extra attention to her. Everything would be perfect except for two things: Ryan is Brianna’s boyfriend, and Brianna is Sarah’s best friend.

Sarah forces herself to avoid Ryan and tries to convince herself not to like him. She feels so guilty for wanting him, and the last thing she wants is to hurt her best friend. But when she’s thrown together with Ryan one night, something happens. It’s wonderful... and awful.

Sarah is torn apart by guilt, but what she feels is nothing short of addiction, and she can’t stop herself from wanting more...