Wonderland: Virtual Adultery and Cyberspace Love (2007)
"Carolyn is a 37 year-old mother of four in the midst of a passionate affair that is tearing her family apart. She's spending up to 18 hours a day with her lover, and her husband is in despair. But the extraordinary thing about this affair is that Carolyn's lover is man she has never met. Because he's not a human being. He's an avatar (or computer generated figure), who exists only in the virtual world of Second Life. And their relationship exists only in cyberspace."
But, anyway... that couple seriously just needs to get divorced. They're both obviously unhappy together, and "working on a marriage" is such a silly and useless thing to do. If it's over, it's over. If Carolyn has to resort to spending her life on a computer to be happy, she needs to rethink her existence or something.