When happy ever after seems like it is just for story books and movies, you have to make decisions to move on and possibly get a divorce. When children are involved, it makes things very difficult, but you will want to have a civil divorce in which you can still communicate. This is because you'll have to deal with each other until the children are adults themselves -- and you want to set a good example for your children on ways to get along.
Communicate, clearly and respectfully. Even though you may not agree with your ex-spouse, you should be willing to listen and communicate about domestic matters.
Do not judge your ex's choice of partners. This is one of the most difficult steps in divorce -- accepting your ex-spouse's new romance. Remember that time heals everything, so eventually you will be unaffected by the fact that your ex has moved on with someone else.
Avoid asking your children about their other parent. You will naturally be curious and want to know what goes on with your ex when you're not around, but good parenting means respecting both your children's and ex's privacy. If you find this hard, just think how it would feel if your ex asked your kids about you. You don't want to put your children in the middle and cause them discomfort.
Remember that your ex-spouse is still human with feelings. Regardless of how bad your breakup was, you have to remember that you did marry this person, so at least offer your ex basic, decent respect.