Here are some suggestions for short romances. I have them broken into three categories, since I didn't know what type of romance you are looking for. I also included a few more suggestions than usual, hoping that this will help you find something on the list that appeals to you.
If You Come Softly by Jacqueline Woodson.
After meeting at their private school in New York, fifteen-year-old
Jeremiah, who is black and whose parents are separated, and Ellie, who is white and whose mother has twice abandoned her, fall in love and then try to cope with people's reactions. 181 pages.
Flavor of the Week by Tucker Shaw.
Cyril, an overweight boy who is good friends with Rose but wishes he
could be more, helps his best friend Nick woo her with culinary
masterpieces which Cyril himself secretly creates. Includes recipes from the story. 220 pages.
Who Am I Without Him? Short Stories About Girls and the Boys in Their
Lives by Sharon Flake.
"Teens Laugh, cry, scheme, and dream about the opposite sex in this
fascinating short-story collection spanning the scope of adolescent
love. A girl seeks advice on how to steal her best friend's thug. A boy discovers what it means to be a man through his treatment of a woman. A teen's severe skin disorder makes her retreat inside her own room, inside her own head. These stories are often humorous, always on-point expositions of youth determined to find self-worth, any way they know how." 168 pages.
What My Mother Doesn't Know by Sonya Sones.
Sophie describes her relationships with a series of boys as she searches for Mr. Right. This is a verse novel, so it is all in poems. 259 pages.
The Girl who invented romance by Caroline Cooney.
While waiting for her first big romance and observing the sometimes
rocky love affairs of her parents and brother, sixteen-year-old Kelly
develops a board game called Romance. 182 pages
Cyrano by Geraldine McCaughrean.
Ashamed of his ugliness, long-nosed Cyrano de Bergerac, a brilliant
seventeenth-century poet and expert swordsman in the French army, helps a rival woo and win Roxane, the beautiful cousin Cyrano loves in silence. 114 pages.
Victoria and the Rogue by Meg Cabot.
Growing up in far-off India, wealthy young heiress Lady Victoria
Arbuthnot was accustomed to handling her own affairs -- not to mention everyone else's. But in her sixteenth year, Vicky is unceremoniously shipped off to London to find a husband. With her usual aplomb, however, Lady Victoria gets herself engaged to the perfect English gentleman, even before setting foot on British soil. 256 pages.
Blood and Chocolate by Annette Curtis Klause.
Having fallen for a human boy, a beautiful teenage werewolf must battle both her packmates and the fear of the townspeople to decide where she belongs and with whom. 264 pages.
Owl in Love by Patrice Kindl.
A fourteen-year-old girl, who can transform herself into an owl at will, discovers interesting new relationships with both humans and owls when she develops a crush on her science teacher. 204 pages.