Wait, Luke Skywalker May Have Had A Wife?

If this does turn out to be a real line from the novel, it raises several questions. For one, who is the mysterious wife? Mara Jade would obviously be the top contender but it could be a different character. We also have to wonder at what point Luke got married and what happened to his wife? There's no mention of her in The Last Jedi, but that makes sense considering Luke is a private person in the movie and he has no reason to tell Rey, a stranger, his life story. It would be pretty distracting if it were just an off the cuff remark that is never addressed again.