Keeps getting worse, 180 not working

[Buxom]

WH just texted that "we have to talk". I feel sick!! I've been away four days and will return tomorrow. He's been increasingly disconnected and more downs than ups in the last two weeks.

If he tells me he wants a divorce or separation, I know I can't be emotionally reactive. He hates that. I've kept it under control for over a year now mostly and he says he doesn't trust my changes. What I NEED FROM EVERYONE is how is the best way to handle this? I need to be prepared or I know I will blow it.

At what point do I say, " This is not what I want."?? I can listen and validate but I need words!!!! And what else not to do!
If the talk is anything else I can deal, but if this is the big one..... I have to be prepared!!
I feel sick!

Also, he said before, when mad and yelling, that it was me who would be leaving. How do I respond to that cos I have no intention of leaving my house.

Thank you so much in advance for your Help!