Irreconcilable differences. You've heard the phrase many times while reading about celebrity divorce proceedings. Although you never thought you'd see "irreconcilable differences" written out in your own divorce papers, you always knew what it means. It's the polite or legally appropriate way of saying that two people were incompatible. To put it another way, two people with irreconcilable differences might have been arguing day in and day out, non-stop, for years before they finally decided to call it quits on their marriage.
If you and your spouse are no longer compatible, it doesn't mean your years of marriage were pointless, and it certainly doesn't mean that you and your spouse never loved one another. It just means that you've come to realize that you and your spouse have different core values, don't want to live in the same place or don't want to live in the same way.