My X got married a whopping 2 weeks after our divorce was final. Not engaged 2 weeks later, but married...to the woman he swore was just a friend, right up until our divorce was final. You'll survive it. At least he waited a little while and told your kids in advance. It's not great, but you have no control over it, so you will adapt.
"You can't stop the waves, but you can learn to surf." Jon Kabat-Zinn
