You need to lay out what you're comparing your current situation to.
Will you and your husband honestly stay single until the children are in their 20s and can move out and live independently? Can you both afford houses with enough room for them locally so they don't have to change schools? What if your husband chooses to move away?
People whose parents stayed together saying they wish they split up aren't taking into account how shit step parents, step siblings, half siblings, never having a "home" just 2 houses, and once boyfriends and girlfriends come you're never really welcome in either.
Every single event in the persons life is marred by their parents splitting. Every birthday, graduation, wedding, illness, birth of children, children's birthdays... you have to make adjustments.
If I'm ever in hospital after giving birth for example, my mom would always bring my stepdad. I won't want him there right after giving birth but if I want to see her I have no choice.
Remember as well if he has partial custody, your children will be with him and his new girlfriends. She might be awful to your children and resent them for being in "her home" and taking away attention from "her little family" and there's nothing you can do about that. Please go read the step parenting board if you don't believe that. If you think your husband won't allow that, guess again, it's extremely common. My mom and her boyfriend resented me even eating and showering once a day. It was horrendous.
You'll also have to split Christmas and their birthdays. Christmas's for me since the divorce were shit and I've only stopped entirely dreading them now I have my own house and I'll stay home with my fiancé.
Not meaning to be harsh but you need to think about all this.