Don't let him ruin your day with your kids. He is probably upset that he wasn't invited but he needs to know that part of leaving is not being there for the fun moments. Next time don't text him let him text you. I took my kids away last weekend for the first time and it was so weird not to have H with us. I didn't call him at all I let him call us and a few times I just handed the phone to the kids and didn't talk to him at all. He was super nice to me while I was gone but as soon as I got home it was the same on and off treatment. Don't let his moods determine your moods!!!