Quoting Jennybananna:" If the only thing keeping me in a relationship is the kids its time to walk away. If things could be ... [snip!] ... believe kids benefit at all when they have to miserable married parents. Much healthier to have two happily divorced parents."
This. I would have always worked hard for my relationship, and then our marriage, but once we had a child together it became a family and I would honestly work even harder to keep that intact. But if the love was gone or we were both just miserable, I would never want to force my kids to live a home like that. Two happy homes, even with the struggle it takes to get everyone there, is much better than one unhappy one.