Cove of Promises — Margaret Rome

Elise had been loyal and loving for years; it was going to be hard to break the habit now.

"You don't owe me a thing!" she assured Jacques. "But I can see now all these years my mind has been occupied only with thoughts of you. It left me no time to think of anyone else. I've been a fool!"

But somewhere inside, a part of her rebelled against the change -- and so, eventually, did Jacques.

Hero: Jacques de Montague
Heroine: Elise Portland