I'm sure every situation is different. I grew up seeing my mom and dad fighting but what I learnt from that was that you don't run away or abandon your family because you don't want to resolve the issues. It taught us kids that running away from problems is not the answer. My parents, despite their issues, loved eachother and they felt they had something more valuable that they had to make it work than to be selfish and flee. At least that's how I saw it. My sister sees it differently, she says they argued and fought and weren't happy until much later in life when we were grown ups. So what? everyone argues and has issues...love is a choice, not a feeling.
I always say no you don't have to stay together for the children - you stay together (and work on your issues) BECAUSE you have children together, that in itself means a lot. Our lives are mostly lived out...it's them that need their parents.
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again