I am not sure if the advice I am going to give you is DB or not. with that said, if you want your marriage to be saved I suggest that you and your husband go see a family therapist (FT). You both are having trouble communicating. You are mad at him (rightfully so) and he is probably mad at you (rightfully so). The best thing for you two to do at this moment instead of being mad at each other is to work on communication. I ONLY suggest this to you because your husband hasn't REALLY threatened divorce and he has shown that he is willing to try at certain points based on what you have written.
So, set up an appointment with a Family Therapist. At this point you can go alone or invite your husband. If your husband doesn't want to go, THEN you STILL go alone. You BOTH are gonna drive each other away. But you are the one on this board so you need to be the one to lead the way.
Don't complain too much about the injustice of what your husband has done. You are COMPLETELY right about the way he has treated you and its not right, BUT YOU have to drive the ship. Being mad at him is not gonna do much good in saving your marriage, IF THAT IS WHAT YOU STILL WANT.
Me: 28 H: 32 1st marriage 4 both 1 1/2 year married 2gether for 9 1S: 6months 1stepson: 2yo