Again The Magic — Lisa Kleypas

She gave him her innocence . . .
Lady Aline Marsden was brought up for one reason: to make an advantageous marriage to a member of her own class. Instead, she willingly gave her innocence to John McKenna, a servant on her father's estate. Their passionate transgression was unforgivable -- John was sent away, and Aline was left to live in the countryside . . . an exile from London society

. . .and he took her love.
Now McKenna has made his fortune, and he has returned -- more boldly handsome and more mesmerizing than before. His ruthless plan is to take revenge on the woman who shattered his dreams of love. But the magic between them burns as bright as ever. And now he must decide whether to let vengeance take its toll . . . or risk everything for his first, and only, love.