Yes, you WILL be OK! But please don't think you were ever stupid. You believed because you loved and trusted your H and he wasn't honest with you.
Slowly gave you great advice at the end of your last thread. Maybe your H needs to go to the brink or even over the edge to see what he's doing is nuts. However it plays out, please take care of your self and your D first. It's kind of you to try to cheer your H up, but maybe you need to stop doing that. Just my thoughts. Be well.