Recognize that divorce is not a good thing, but insist that your situation is different.

Blame your spouse, take no responsibility for your own behavior, and stop communicating.

Dwell on the past with bitterness and drag it into the conversation at every opportunity that comes to mind. If you are given a glass of water, take that opportunity to tell your spouse how you were drowning in misery for years because of them.

Say that you've "fallen out of love," that your spouse "doesn’t satisfy your needs anymore," and that your spouse "has changed." Or hasn't changed depending on which is worse.

Frequently explain you are worried about the effect on the children, but always the conclude that "it’s worse for them to have us together and fighting."

If you need some more pointers, let me know...