Wondering if anyone has had a similar experience with their teenage kids and can offer any advice.

When H refused to go out for pizza on S14's birthday dinner on Monday, he mentioned that he'd take S14 and D16 out to eat later in the week instead.

Thursday afternoon, when he picked them up from school, he asked them to come out to eat with him that night.
They both said they didn't want to.

When he dropped them at home, he said he'd be back at 6pm to pick them up.

D14 said "How many times do i have to tell you i don't want to go?
I need help with my homework so you could bring some pizza and we can eat here while you help me."

H did not reply and left.
He came back at 6pm, walked in the door and said to S14: "Come on, let's go".

S14 got angry and refused again. H went out to get D16 and she said she wouldn't go if S14 wasn't going.

H kept insisting that they go with him. They kept saying No.

This went on for quite a while. He was acting as if he couldn't hear what they were saying - i.e. he wasn't asking them anymore; rather he was telling them that they were coming to dinner with him.

Eventually he then told them both to come into D16's room for a chat (where i couldn't hear what was going on).

Apparently he then told them that he and i were definitely getting divorced and that he had "met someone new".
S14 said that he told his dad that "That isn't right. You can't do that".

Apparently he also told them that "Everything will be better for me and mummy when we're divorced".

He also said that to me a couple of months ago (darned if i know what he means).

S14 cried and D16 refused to look at her dad (working on Facebook throughout).

H came back into kitchen and told me that he wasn't coming back and that we were getting Divorced. He was not angry, just a bit shocked, i think.

I was strangely calm.
I've been dreading him telling the kids about OW (who I think he had organised to go out to dinner with them tonight).

I think it represents a sort of 'ending' for me. I can't see how there's much possibility of coming back from this. In a way, I suppose, i feel relief. An end to the limbo is in sight. Once she is out and evident to the kids, i can't see that H could ever return to us. How could he face the kids?

Also, this is the first time, i think, that any of the cost/consequences of H's actions have been brought home to him. In all of the last 14 months, no-one has actually said anything to him that negates the fantasy that he's built up about what separation and D will be like.

Later that night H texted both kids.
He said to S14: "Love you, miss you. I'm so sorry"

Then later "PLease tell me how you feel"

To D16 he said: "Love you, I'm so sorry. I really want to spend more time with you"

Does anyone have any words of wisdom about any of this?

I'm worried about the kids. How do you deal with your dad announcing that he has another woman???