I am having so much fun here without you : a novel / Courtney Maum.

Enhanced descriptions from Syndetics:

In this reverse love story set in Paris and London, which The Wall Street Journal hailed as "funny and soulful...immediately appealing," a failed monogamist attempts to woo his wife back and to answer the question: Is it really possible to fall back in love with your spouse?

Despite the success of his first solo show in Paris and the support of his brilliant French wife and young daughter, thirty-four-year-old British artist Richard Haddon is too busy mourning the loss of his American mistress to a famous cutlery designer to appreciate his fortune.

But after Richard discovers that a painting he originally made for his wife, Anne--when they were first married and deeply in love--has sold, it shocks him back to reality and he resolves to reinvest wholeheartedly in his family life...just in time for his wife to learn the extent of his affair. Rudderless and remorseful, Richard embarks on a series of misguided attempts to win Anne back while focusing his creative energy on a provocative art piece to prove that he's still the man she once loved.

Skillfully balancing biting wit with a deep emotional undercurrent, this "charming and engrossing portrait of one man's midlife crisis" ( Elle ) creates the perfect picture of an imperfect family--and a heartfelt exploration of marriage, love, and fidelity.