Go home. It's your house. You are growing a human being
If he is too selfish not to be gentle and good to you, then think about who needs kindness more. A man who is lying to you or a tiny baby.
Ignore his tantrums. And if you feel like calling the OW then do it. It probably won't make a difference in the scope of things. Be prepared for your husband to possibly be telling her that he had no idea you were pregnant.
But listen, right now your husband is a grown-up man. He does not need your kindness as much as your child. A week for a baby is like a year for a 40 year old. Think about it. You will never have this first trimester with your baby. If he wants to miss it then so be it. I think when the advice of detaching is given its seen as an unplugging. Please think of it detaching from negative Source but tapping into a live, positive one. Sorry for barging back into this thread but stories about men treating their pregnant wives is upsetting.
You deserve all the glory that comes with being a mom. Don't forget that.