While I think this is really good advice, I think it is equally important to consider what staying together would be like for the kids. Some relationships just need some hard work and are worth saving. Others are truly toxic and are a very bad environment for kids. I know my childhood was far better with a single mom and then a loving step father than it would have been if my mom had stayed with my biological father. I didn't necessarily know that when I was 6 and they split up, but by the time I was a young teen (and I maintained a relatively good relationship with him up until about a year ago) it was very clear.