Once and for All by Sarah Dessen

Louna, daughter of famed wedding planner Natalie Barrett, has seen every sort of wedding: on the beach, at historic mansions, in fancy hotels and clubs. Perhaps that’s why she’s cynical about happily-ever-after endings, especially since her own first love ended tragically. When Louna meets charming, happy-go-lucky serial dater Ambrose, she holds him at arm’s length. But Ambrose isn’t about to be discouraged, now that he’s met the one girl he really wants.