I am so so sorry this happened. You have been given really good advice, my advice is to follow it.
Read up in the library on the 180, and there are lots of good articles that you will find.
You are in a crisis so you need your health, things just got very tough. Drink water, sleep, exercise and avoid alcohol. I know it isn’t easy.
Find support. Here is one place… do you have a friend you trust, that will be on your side.?
Focus on you.
About him…he is in limerence, we call it the fog. Essentially he believes that he is in love and that is because his life before somehow was wrong. While it is a bunch of malarkey it is his reality, so expect a lot of skewed thinking, decision making, history rewrites. This is ALL him.
about the lies, trust that most of what he says going forward is a lie and has been since for a time. Do not believe anything that comes out of his mouth. Validate it all. For me the lying was the hardest part.
About the future. I know it is scary, but you will be ok. You are a really strong woman. You have great kids who need and love you. And you are smart.
Also remember, he selfishly did this… not you. You are worthy and deserve much more.
Be strong, protect yourself and your family.
Lots of hugs.