MIND YOUR OWN BUSINESS. THAT DOES NOT INCLUDE HIM AT THIS TIME.
If and when he calls, say hello. Ask how he is if you feel like it. Tell him about the girls, how they are etc... Do not talk about the relationship AT ALL.
If he brings up the relationship, you can feel free to tell him that since he has obviously already made his choice, and since you have decided that you will not allow him to go back and forth any longer, there is nothing to discuss.
Then END the call (say the baby is crying if that's what it takes) saying "Drive safe. I'll talk to you soon". AND HANG UP.
THIS IS DBing and this is YOU standing up for yourself and demanding better treatment because that is what you DESERVE.
