I'm so sorry that this has happened, how horrid for you. I agree with some other people here; you can get through this and emerge from it eventually very happy. One day you'll probably put it in the list of top ten things that ever happened to you. In the meantime, remind yourself every day that you're a top bloke, and she's a cheat and doesn't deserve you.
Something ugly I feel the need to mention now re JW rules, and I apologise as I realise it's none of my business, but it might be something that hasn't occurred to you. In a JW marriage, if a spouse cheats and the other decides not to forgive them, the victim can divorce and remarry without facing any JW repercussions; that's probably not something you care about at this point. A technicality they don't mention much is that if the victim then sleeps with their husband/wife again, that is considered forgiveness for the adultery, and the victim loses their get-out-of-marriage free card. It creates some ugly situations, I'll tell you one I know of: My mate, we'll call her Joan, discovered that her abusive JW husband had cheated on her. She decided to leave him, but had slept with him in meantime. Five years later Joan is divorced and remarries, and she is disfellowshipped for adultery, and her ex-husband is made an elder.