I do understand your concerns, I really do. The internet, the chatroom, the OW are all a part of the MLC and it's rituals. These things you mention are apart of the world/life your H has created for himself, so he can be the man he thought he should have been, he had chosen a different life path. These things are buffers, bandaids to mask the pain he is in, for if he is busy being this person he portrays, he no longers feels the pain coming from within.
He no longer feels the anxiety of growing older, not achieving all the dreams he once had, no longer feels the guilt of what he is doing to you and your marriage. He feels better, he is possibly feeling he is rescuing someone, a hero even, he can be someone other than the man he found in the mirror before all of this started.
You can't do a thing to help him, you can't fix him, YOU DIDN'T BREAK HIM. All you can do is take YOUR focus off of him and his antics, and redirect it towards yourself and your family. The more you focus on him, the more anxiety you will feel, the more you may place upon him, the more he is going to feel the stress, the more he will need to escape, the further you push him away.
Detach my dear, GAL, don't waste your time worrying about him right now. Use your time healing your own heart and feelings, so that you too can become the person you were meant to be. The closer you watch something, the crazier it will make you feel, the longer it will seem to take.
Sad, yes, it is sad, however, there is nothing you can do to change his direction right now although you can make a difference. Take charge of your destination, enjoy what you do have, and explore the possibilities in your life.
Take care of you, God Bless!
Love, Laughing
Jeremiah 29:11 For I know the plans I have for you.........