Your dignity will show that you are not guilty more than anything else. I split up with an EA ex and didn't try to fight my corner one bit. A lot of people believed him that I was a cow and a bitch, I must have cheated or why else would I leave him? But I remained dignified. The thing with liars is they start to believe their own ramblings and then begin embellishing to support the new truth they create. Others do notice this. A year after I split from him one of his friend (who was never really my friend) came up to me in a pub one night and apologised, he said everyone had seen the story progress and me be consistently demonised and put into ever ridiculous situations about how I was supposed to have behaved. You may be seen as guilty by those who don't matter in the short term but longer term things do have a tendency to correct themselves.
It has only been a week since your world imploded, a week ago you thought you were in a strong relationship and secure and happy. Now you realise you don't even know him. It will take time for you to feel secure again but it will come. Time truly is the only healer.
I think maybe the initial anger has subsided and you are feeling the sadness and bereavement of what you thought you had. Your husband was not the man you thought he was, you know that but you still need to grieve. But life does get better, it always feels like it never will when you are in the depths but it sneaks up on you that a brighter better life is there and that you have survived and become more than you thought possible.
Take care of yourself, eat, get yourself up and about, do wonderful activities with your girls and start building little goals for you. Positive goals can be as small as learning to bake a cake or a cooking a new dish, or they can be huge things like climbing Kilimanjaro or learning to parallel park. Give yourself a list of things to do for you aim to build you and develop you every day.
You are a strong woman and you are going to come out of this happier than ever with the true life you deserve and with someone who truly loves and respects you. No matter what happens in his life he will never have that comfort, he will always have at the back of his mind what he would have had if he wasn't such a selfish git.
I'm sure you don't feel strong at the moment but you truly are. I can only hope that if I was placed in your situation I could act with such dignity and grace.
Take care and I hope you get a good nights sleep, the world will begin to seem brighter again soon.