Mates, Dates and Tempting Trouble by Cathy Hopkins
When Luke, the boy that Nesta has been dating, declares passionate love for TJ, she doesn't know what has hit her. She does her best to avoid him, but when the local school are asked to work together on a project, Luke is chosen as the overall co-ordinator and TJ has no choice but to report back to him on a regular basis. Misunderstandings and miscommunications threaten the girls' friendships and split them into two camps: Lucy and Nesta, Izzie and TJ. Will their friendships survive? And what will TJ's steady boyfriend, Steve, make of it all?