The Cursed by Cathy MacRae

Rosaline Johnstone believes she has been cursed by the faeries. Will it keep her from marrying the man she loves?
Betrothed four times, none of her suitors have made it to the altar. This time she’s in love, but if she agrees to marry him, his death will be on her head.
Walter de Ellerton, deeply religious and a fervent keeper of the chivalric code, has patiently sought the right lady to marry. He has at last found her, the woman of his dreams, and though she professes undying love, she refuses to marry him.
Caught between the machinations of a wily Scot, the ambitions of an English lord, a vengeful clan chieftain, and the mysterious works of the faeries of Eaglesfield Burn, Rosaline and Walter must break the curse Rosaline believes was settled upon her many years ago—or risk losing their chance to live happily ever after.