Nicole, it would be great if DBing worked all the time, but like 25 says, by the time people get on this site their marriages are really in trouble. I'm a perfect example of that. You may be as well. But I know that if I hadn't practiced the techniques discussed here, I'd've wallowed in my misery, and would be far worse off.
You say you wonder what's happening. I think what's happening is you are his plan B, C or D. He's not pushing the divorce forward in case things don't work out with his 25 year old girlfriend.
Is your sense of self worth so low that being plan B is ok with you? I think not; don't act like it. You don't need him waiting for you to make sure you're ok. No, you're not ok, you're moving because he left you and said he's filing for divorce. You don't need him to check and make sure you're ok.
He has decided that working 60-80 hours a week and his new girlfriend are more important than you are. Until he changes his mind (don't count on it) you need to distance emotionally (!) as well as physically.
M:23 T:26 Me:53, Wife: 60 S:18 D:16 filed 7/16 W moved out 4/28/17