You also have to think about what message you're sending your kids. You want them to know that it's better to be happy than not. As well, you deserve to be happy. Do you really want to be in that relationship? I doubt it. No one wants to 'pretend' to be happy when they could meet someone who could make them happy. I agree with Panama that two separate people who are happy and pursuing their happiness is a much better environment for children than two people living together who are unhappy.

Regardless of what you present to the kids, they'll sense it. Besides, today there is no normal family so the affects or stigma that you felt when you were younger most likely doesn't apply today.

Child support is never protected by a prenup....

Just saying, my mother divorced my father when I was 5, and I'm glad she did. I have come to know my father in my 20's (he was never there for me as I was growing up), and I could see how potentially horrible childhood I could have had if they stayed together. My mother is an amazing role model for me; she is strong, brave, independent and passionate about her work. She taught me that happiness isn't about finding a man, it's about finding what I want to do and pursuing it.

Children know when things are going bad in a marriage. The job of parents is too lead by example. When you or your spouse are cheating on one another what message are you sending to your kids? I know a couple he constantly cheats on his wife. He leaves her with the kids sometimes for months. Then they reconcile he comes back and if they get into a fight again he leaves. This has been going on for years. What a horrible message they are sending to their kids. They have a boy and a girl, the message they are giving them is it's okay for guys to cheat. The mother for allowing this to keep happening she is telling the girl this is acceptable. I see this marriage as abusive to these children. I hope these children will grow up and remember their parents awful marriage and not chose a marriage like that.
I am divorced from my husband. We are friends my kids sometimes hate it because we are tougher parents than when we were married. I know it's hard but you need to forgive one another in a divorce. Lead by example and show them you can end the bitterness and move on. I did I have people who are envious of me because I get along with my ex. We hang out together and my ex-in-laws invite me to parties because I have a great attitude.

Do what you can to save the marriage. That's just my opinion. You two did exchange vows after all. Fight for it. Wait until baby number two is born at least. As a divorced single mother you will still have to cook, clean and look after the kids. So leaving you husband because you don't like doing those things doesn't make sense. Just think very carefully before walking away. Time to be practical. If you decide to walk, keep it quiet until you have everything organized. It may take a year of planning.