SOLVED. YA Contemporary Romance - it's about a boy who secretly dates a girl who has a boyfriend and then she dies and he has her diary i think? There's a girl named Kirby. I read this book in 2009. [s]

[Liz]

The main character becomes friends with the dead girls brother.

[Mai]

Searching online I found The Secret Year by Jennifer R. Hubbard.
Take Romeo and Juliet. Add The Outsiders. Mix thoroughly.
Colt and Julia were secretly together for an entire year, and no one, not even Julia's boyfriend, knew. They had nothing in common, with Julia in her country club world on Black Mountain and Colt from down on the flats, but it never mattered. Until Julia dies in a car accident, and Colt learns the price of secrecy. He can't mourn Julia openly, and he's tormented that he might have played a part in her death. When Julia's journal ends up in his hands, Colt relives their year together at the same time that he's desperately trying to forget her. But how do you get over someone who was never yours in the first place?

(The name Kirby is mentioned in the readers' descriptions)

[Liz]

Mai wrote: "Searching online I found The Secret Year by Jennifer R. Hubbard.
Take Romeo and Juliet. Add The Outsiders. Mix thoroughly.
Colt and Julia were secretly together for ..."

That's it!!