Try some of these:
William Shakespeare is good for romance, but he has written many comedies and tragedies too.
Any of Jane Austen’s books are guaranteed to have romance in them.
Any books by Amelia Atwater-Rhodes are amazing! There is In The Forest of The Night, Demon In My View, Shattered Mirror, Midnight Predator. And then there is the The Kiesha'ra series: Hawksong, Snakecharm, Falcondance, Wolfcry and Wyverhail.
How To Kill A Rock Star by Tiffanie Debartolo
The Princess Bride by William Goldman
Nick and Norah’s Infinite Playlist by Rachel Cohn and David Levithan
Tuck Everlasting by Natalie Babbitt
A Great and Terrible Beauty, Rebel Angels and The Far Sweet Thing by Libba Bray
The Morganville Vampire series (Glass Houses, Dead Girls Dance, Midnight Alley and Feast of Fools) by Rachel Cain
Beauty: A Retelling of the Story of Beauty and the Beast by Robin Mckinley
Wuthering Heights by Charlotte Bronte
13 Little Blue Envelopes and Girl At Sea by Maureen Johnson
All-American Girl by Meg Cabot
Poison Study by Maria V. Snyder
Old Magic by Marianne Curley
Peeps and The Last Days by Scott Westerfeld
Blood and Chocolate by Annette Curtis Klause