OK - I wish that was the case, I really do. Early on I thought the same thing about my EW, it is hard to not read into things. Over time though you just get emotionally wore out from doing it and eventually you stop and that desire becomes less and less.
I never imagined in a million years my EW would have done what she did. Never, ever. Me and our girls were the only family she had. She told me many times I was her rock and we were together for 17 years.
I will never understand what happened and how she got to the place she is in but I have accepted it. I will never take her back......she has caused too much damage and I could never truly forgive her for the pain she has caused. I will always love her as the mother of my children but our path's are going to be forever different.
Over time you will get there. Chances are the consequences she will face will have nothing to do with you or S3. It will happen when you least expect it, it will be totally random and more than likely by then you will have moved on yourself and you might be married again in a loving R that blows what you and your W had out of the water.
Eventually you will accept these things and truthfully your E might never feel the consequences of her actions or if she does it still might not mean that she turns back to you.
This board is more of a support group than anything else. Some people DB like [censored] and their spouse returns. Others DB perfectly and the spouse never returns. When everyone first arrives that is all the want, they want their spouse to return. Over time you will make the shift and the desire to save yourself will be more important than your spouse returning.