You are going through something no one wants to experience. You are correct a woman's sixth sense rarely lies. I'm sorry you're going through this. You were spot on with checking up to see if your intuition was correct.
Unfortunately it was correct and now you are faced with a ton of emotions to process. Give yourself time to process. Expect it to come in waves. You may feel empowered one minute, and hopelessly lost the next. Both are valid feelings.
If you don't plan to get couples or individual therapy or work toward reconciliation, then I would research attorneys with good reviews. You want one that isn't too aggressive but is reasonable and logical. They will reign you in when off the path, and they will stand up for you when you need it most.
If you have a joint account take out half the money and keep it separate. He can clear out anything that has both your names on it, so be proactive. Many have been blindsided by their spouse hiding assets or cleaning out the bank account.
Best advise, get all documents, taxes, financials, pension, 401k, stock or anything similar and start putting questions together to ask an attorney. Information is power, and with that you are in the best position to negotiate if you know where you stand legally and financially. Google what to include. Remember not to use your attorney as a councilor, they charge $300 an hour and that will get pricey fast if you do. Think logically like a business transaction, not emotionally.
He may try to walk this back. He may not. You might not want to let him. All paths you have to decide for yourself. Reach out and don't be afraid to vent and get help from those that have already been down this path. Lot's of great people, no one judges and it's a safe place to talk. Lots of topics that can help you along the way, and we are all here for you.
I'm really sorry this happened to you. No one expects it when it happens.