Wendylon, I think that your H is trying to establish that he is "on his own" by being vague. He wants to communicate that he doesn't have to tell you where he is or when he's coming at all, because he's not living with you anymore. He's showing you this through his behavior. My advice? I agree with MKB. Give him space.
I kindly disagree with Tumbling and her H's arrangement when they had parties. I also thought I was being accomodating by letting my H go to parties alone or driving in separate cars, bc I myself don't like late parties. I like parties if I can leave before midnight. My H wanted to stay till the closed the place. But our arrangement resulted in my H making single friends who didn't know me that well. It resulted in him feeling we were separate, that we didn't share the same experiences and social circles.
The key for you now is: space. And GALing too. I know it must be hard with the kids, though, but give it a try.