I think if he was open about wanting an open marriage then there isn't really anything you can complain about. If you both went into this marriage thinking the other would change then it falls on both sides. I think you both need to talk about whether the other side is something you could be okay with. If he just can't bring himself to be in a monogamous marriage and you can't bring yourself to be in an open marriage, then there isn't really anything WRONG with either of you. Just 2 different viewpoints on an extremely important subject. If you can't come to a common ground then it might be time to go your separate ways.....