I moved abroad when i split from my H. I took our two kids with us. But we were halfway through the process of moving abroad when i found out about his extra curricular activities. So i just carried on with the move.
Just before i moved though, i met someone new, and he followed me abroad, six months later. He didn't settle and i didn't settle nearly as much as i thought i would so we moved back to the UK.
It is worth noting that I was moving to my home country where my family live. But after 11 years here i found the differences too frustrating. I also felt smothered by my overbearing Mother, who i get on fine with long distance.
Also re taking the children away from their Daddy, he has an older son who lived around the corner from us that he never saw, and i knew that even if i stayed in the same town he would probably not have any contact with them.
As it stands he never saw them during the 15 months i lived abroad, and although we only live an hour away from him now, he has only made the journey twice, based on a friend giving him a lift. It is up to me to pressure him to have them , when i need the break, and do the travelling, each time. He now hasn't seen them since Easter and i dont expect he will see them anytime soon. So in a nutshell that side of things had no impact on my decision to move abroad.
Moving "home" was something i always wanted to do. I did it, and it wasn't what i dreamed it would be. So i came back and i am now happier than i have ever been. If i hadn't tried it, i would probably still want to do it. Try it, dont regret the things in life you haven't done, regret the things you have.
Some more details may put a different slant on it though, eg childrens ages, is he an interested Dad, etc etc.