It happened a while ago, years ago, really, but I'm only just now getting around to saying it out loud. I forgive you. You walked out one day, and it was the hardest thing in the world to accept, that you had moved on to another family, that you would be present for them but not for us, that they had won.
There probably aren't many people who haven't heard the words "marriages take a lot of work." This is a good thing to be aware of prior to making a marital commitment. Knowing that that's the way it is, minimizes the likelihood of feeling surprised or broad-sided when the inevitable breakdowns occur.