Secrets of the Morning by Virginia Andrews
Dawn can hardly believe she's a student at one of New York City's best music schools. Now her most precious wish, to become a singer, can come true. But Dawn still dreams about Jimmy, her strong, intense boyfriend, and the love and anguished secrets they share.
Then Michael Sutton arrives, a new teacher at the school, a singing star and the most wonderful looking man Dawn has ever seen. Together they create a world of feeling Dawn has never known. In his embrace Dawn awakens to disturbing, unfamiliar desires, and Michael's promises offer a vision of music and romance forever... until he disappears.
Dazed by his cruelty, alone with the bitter fruit of his betrayal, Dawn becomes, once again, a victim of her grandmothers twisted schemes. Desolate, she clings to the tender hope that Jimmy will return and renew with her their deepest hearts' dream...