You've gotten some really good advise from the others. But, you really need to protect yourself. Visit a lawyer for a consult. Move some money if you can so you have some in case your H retaliates by emptying your bank account.
I'm not saying that these are permanent steps. Your M can still be saved but you have to protect yourself in the short term. When my H was still deep in lala land with OW, he stole money from my account, left the kids alone and even called our landlord to try to get out of our lease and stick me with it.
We've come back from the brink but it's rough at the start. Come here often. The support is fantastic.
