Good Teen Romance Books/series?

ok i LOVED the Twilight series The Host by S.M. and i cant get enof of the romance books ive also read The Truth About Forever by Sarah Dessen and planing on reading more of her books but i was just wondering if there were any other books...i like the long books, like the books over 300 pages so if there are any books u sugest plzzzz tell me!! and im a teen so no lil kiddie books plz