@sozobe,
Agreed. If it is a case of physical and emotional safety, better off is a perfect term and completely defines the situation.
To derail just a tad..
In my opinion only, kids are better off ( again saying this loosely) when parents can realize and move on when a relationship is not working for both parties than when they choose to stay for kids sake. ( no this does not include all reasonable arrangements)
Why?
because the kids then learn that it is ok to stay in a life / situation/ relationship / job etc, when they are not getting what you need and are having to ignore what you want out of life. They , in a very round about way, learn and mimic to not expect and not create what THEY need for themselves, rather just going forward almost blindly.
Kids copy to a huge extent exactly what they learn in their house hold. I personally do not want little bean to learn to cope with someone who makes them feel less than. I always want her to feel confident in the ability she has to MAKE her life what she wants and this includes the shuffle in and out of people, whether it be friends or lovers. There are millions of people on this planet, to feel as if you have to stay with one who does not contribute equally or is not interested , or caring, or what ever the reason is not always necessary and can be a hard lesson to teach a child too. The chances of them doing the SAME thing are pretty high .
I want her to learn that some consequences ARE hard, require an entire change of life, but that it is ok and that it is important and mandatory at times to put yourself first, your children first and require people around you to do the same when it is necessary.
I know this is a very simple, common thought.. and not in any way supported by any testing or studies, but for me personally.. this is my rationale for a bad relationship between two adults with children involved.