I don't know why this has happened for the second time in a week. I think maybe it's because I don't care anymore? It's wrong, yes, and counterproductive, but I didn't realize how much stuff I bottled up the past several months. Her cake eating, lying, etc just got to me.
If you truly didn't care anymore, her behavior wouldn't upset you. BTW, what were you doing up at 12:30 am on a Sunday night? You weren't waiting up for her were you? If you were, you took her bait, hook, line and sinker.
Your latest feelings about divorce are prefectly natural. Nobody would blame you for pulling the plug, given her behavior. It really comes down to what you think is best for your kids and for you. Just make sure that you think through any decisions with long-term implications. Doing nothing is a decision that might have long-term implications as well.