I moved to a little island in the middle of the sea, and what I can't see won't hurt me....
But, seriously. The problems weren't as big as with your DH. He goes out to evening meetings a lot, and would then go to the pub for 'a couple', and not come home until 6am sometimes. He did it a lot pre-baby. It stopped for a bit, then picked up again. I used to say the same stuff, I just need to know where you are and when you are coming back. But often he didn't know where he was and when he was coming back. I tried just going about my and DDs lives, ignoring it. The thing that worked the most was guessing when it was going to happen (ie, certain people always made it more likely) and just saying - I'm not expecting you in my bed, at all, and I will see you in the morning, in a reasonable state.
But it was pretty unresolved and being here means he does what he likes all week and plays devoted father and husband all weekend . And I pretend it's not happening.
More than you bargained for, sorry!
I've also found that I drink far more than I ever did or meant to. Not even to excess, just more regularly really. And I don't like that either but that's my own stupid fault!