When Love Dies (Sweet Valley High #12) by Francine Pascal - Vintage Paperback

The Wakefield twins' older brother, Steven, is heartbroken. His girlfriend, Tricia Martin, no longer seems interested in him. She breaks their dates and doesn't return his calls. Steven can't understand why Tricia's feelings have changed so suddenly.

Jessica is thrilled that Steven isn't dating Tricia anymore. She sees it as the perfect opportunity to pair him with her best friend, Cara Walker. Elizabeth, Jessica's twin, thinks that scheming, gossipy Cara is all wrong for Steven. She's determined to find out the reason for Tricia's strange behavior—and horrified when she discovers the awful truth.