I am sorry you are upset with your fiance - but, personally, I don't see any reason to be. Being that he is still legally married, although, separated, setting an actual date for marriage appears to have been a bit premature. You may wish to be patient and allow the divorce process to go through. If your fiance has an attorney handling this matter, then you should feel good about all of this, knowing that it will go through. Since I am also a legal secretary/paralegal with 29 years experience in the State of California, I know only too well that matters such as this can take some time to resolve....however, it appears that it is moving right along....again, I would just be patient and allow your fiance to handle this matter, at his own pace...for that will help him put proper closure to his marriage - so that it doesn't interfere with the marriage/life you wish to have with him.
I wish you and your fiance the best.
Peace, Love & Happiness,
The Mystic Wave