Yeah, I remember those detaching feelings. The distance growing. It felt weird, and uncomfortable, and sometimes frightening because you are both really letting go...
But in the long run it will be great for you. It will give you the strength and confidence to really focus on you, grow, be a better person, be strong for whever this all leads... you'll come out of divorce strong and be a real gem for some future guy lucky enough to get you...
Now, the sadder part of this is your husband's detachment will not only occur with you, but by not living with his kids he will eventually detach from them as well. My husband said this was one of the more difficult things for him. Of course, he didn't realize this was occuring until months later. It's very gradual and unless you are really thinking about it you don't even realize it's happening. ... And slowly the kids too will detach from him. I've watched this happen in my friend's divorces.
There is no arriving, ever. It is all a continual becoming.