That being said, who is with me that a divorce option would be amazing and that future DLC should have more marriage canidates. Especially ones with a more in depth quest plot, such as rescueing/kidnapping(stockholm syndrome)/arch enemy turned lover. Anything more than "hey, brought you this big mammoth tusk... you interested."
It does say specifically that marriage in Skyrim is culturally not meant to be lifelong and they take advantage of the time they have.