In the United States, about 50% percent of first marriages, and 60% of second marriages, end in divorce. Yuck. Really? If you're unhappy in marriage, is divorce really the answer? Sometimes, yes. But how did things get that bad? How do you avoid the "that bad"? How do you avoid divorce? You work on it. Always.
Most people don't wake up one morning after years of blissful marriage and decide to get a divorce.
Are you happily married? Could you be happier? Don't wait around for "that bad." Don't just exist together. Let him in. Trust him. If you want a love as great as Jim and Pam's, then mimic their humor, mirror their kindness. Make your marriage awesome now, girls.
Edit: While we wish and hope for staying married, there are legitimate reasons for leaving. Please, oh please, if you are in an abusive marriage or relationship, get out. Seek help. No woman ever should tolerate abuse. You are far too precious. Go here for more information.