To quote a reliable source, when my STBEW finally told me last night she wanted a divorce and she has been having an affair, I told her I will take 50% blame for the divorce, but you can have 100% blame for the affair. She left after that statement....good riddance!
What you do is your bag of crap, and what she does is hers. Keep focusing on yourself, start a new hobby, exercise you ass off, hook up with old friends (no affairs please!).
180 is the way.....she will either get her chit together or she won't...you have NO CONTROL! It's her bag! Feel your pain, embrace it, learn from it, and leave it.
Spend quality time with your kids...don't question them...they are not the shock absorbers between you and your wife.
Mine said she wants a divorce...I'm gonna make her file it! Again, her bag!
Sorry to be so tough, but 90 days in, either she is gonna work it or not.
God Bless and one day at a time!!