He could move on with his life very well, in the same manner that you did. He could divorce Terri, but he won't. He's obviously moved on, but he still wants to control her.
I suspect that with the litigation he is unable to proceed with a divorce. We never hear his side of the issue except the emotional ganging up accusations of neglect etc that come from those supporting her and her parents. I suspect he has a whole different version of the proceedings and I would like to see it presented if you may provide me with a link to his side of the story.