Anyone thinking about "staying together for their kids" should talk to people whose parents divorced and ask them, "Were you happier before or after your parents split?" Cases vary, but the people I've had that conversation with have all said their parent's divorce was a relief.
I know there are people who claim "divorce as such" is bad for kids but I'm very doubtful about that. Divorce can be good or bad depending on how it's done, and how interested both the parents are in their kid's well-being.
My opinion -- as someone whose parents divorced when I was 5 -- is that merely staying together and being miserable isn't necessarily an improvement on divorcing, but getting into couples therapy and working through your issues is vastly better, for your kids as well as for you, than either a miserable marriage or an acrimonious divorce.
I know there are people who claim "divorce as such" is bad for kids but I'm very doubtful about that. Divorce can be good or bad depending on how it's done, and how interested both the parents are in their kid's well-being.