After spending almost 2 hours with daughter, and on the way to sporting event together, he says: OW can bring daughter over to house... and you could go to your office.
I looked at him and said, Well that's highly inappropriate. H: Why. Me: Aw... cuz it's MY house and as long as I'm there, I'm not going to "hide" in my own f'g house. Sorry. H: But you said you'd "disappear" if I had to bring daughter to house. Me: Only because she was sick. You needn't think that I'm going to chase me out of the comfort of my OWN home. H: oh. Me: NOR will I jump through hoops for OW to feel MORE comfortable in MY home than I am. Not happening. H: Oh, ok.
WTF?
You laid an important boundary, enforced it, and he responded positively. Lesson learned.