I agree w/Sotto...don't text or call him. What he's trying to do is convince himself and others that even though you are separated, he's still being a good dad, or should I say, he's practicing being a Disney Dad. He really doesn't need to tell you what he's doing w/the children because they'll tell you themselves when they get home. It's all about appearances and reactions. He wants to get a reaction out of you.
If he mentions it again, say thanks for the update and leave it be. It's not necessary to respond to messages such as this.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
