You can't do anything until you can talk to him. You can't make a decision by yourself. It is unfortunate that his is behaving this way but you still don't know if he will end it with her and vow to never see her again. He has to take that first step. In the meantime, try to decide what you want from all this. Do you think this relationship can be saved now that you have all the information. What do you want considering he is having sex with someone else. Can you live in a relationship where you will always wonder. Would a marriage counselor help you make sense of this. When you hear from him be prepared to have these answers. You have to wait because you can't reach him. This is important time to decide what you want. Prepare the questions you will have for him as well.
If this has been helpful press accept
I totally understanding. The wait must be murder. If he is unwilling to go to counseling, can't communicate, and refuses to change the hope for this is not good. I know you want it but he has to want it too. It sounds like he isn't willing to do anything. You at this point are at his mercy but really decide how much this is costing you
Going to bed. Hope your news tomorrow is better