Oh...and still getting the I miss yous from H. I am responding with "you know where I stand." and "Under the circumstances, I will not talk about this".
You're handling this brilliantly!
If he wasn't doing this before and now he is, it means the shine is starting to wear off the fantasy. Keep interactions friendly but brief.
Now that summer's here, can you take the kids and go somewhere that WH has fond memories of or someplace he always wanted to go with you but didn't? Go, have fun, and make sure kids report it back to him. It will further drive home what he's missing by not being there.