It is still possible to be blindsided because you still love your H and you were hoping for the best.
I know it feels like a setback, but it simply is that you are getting more of the truth. Let that motivate you to detach more, and be even more committed to the DB approach.
Continue staying as dark as possible... NC unless necessary. No more R talks. You've said what you wanted to say. Now you need to take care of yourself, GAL and find 180's to do. Most A's end, usually within a year, so if you continue with what you are doing, you have a better chance of turning things around.
You can do this. You have been strong, and you are an amazing woman. Be the better option. We are here for you!