She's playing right now, its fun, it will wear off. You've got two kids. At least try to get help (marriage counseling). There are a lot of implied issues hidden in your posts, but nothing that is not fixable. Ask her to go to marriage counseling. The cost of a divorce will likely be greater then counseling if you go that route. She may be seeing someone, are you able to deal with that if it's the case? She sounds very torn right now so if she aggrees to counseling that is definately worth a shot.