Listen, my ex-wife did this to me. One morning over breakfast while the kids slept she said "I'm done, I don't have to try anymore."
I gave her my best polite and concerned WTF and she explained that all the boxes were checked:
Married
Kids
Car
House
Husband with good job
So she didn't have to try anymore. Life was accomplished. Then she sat on the couch for the next few years, ate like shit, got fat, became a bitch, and stopped putting out.
I made clear that this was not something I approved of and she countered that she'd take my kids, house, money, etc. in divorce.
So I started fucking other women and eventually we divorced. She's got my kids, the house, half my money, etc.
Protip from someone who's been there: You make it clear - politely at first - that her Cunt Threat Meter needs to drop back down to Zero immediately.
Don't add a threat, just tell her to knock it off. No implied "Or else." Tell her you love what you two ****used to have **** and you want it back.
Then, if she refuses, go see a lawyer, have all kinds of paperwork regarding marriage, custody, money, etc. drawn up. Secretly. While at home you are as calm and kind as fuck.
Once the paperwork is satsifactory, divorce her ass and toss her to the curb. Don't be a douche, but don't show your hand until it's too late.
That's the only thing I'd have done differently. Divorced the bitch before I started fucking whores. First you divorce, then you fuck whores.
Or be a betafag and leave things as they are until niggers are fucking her while you wank in the corner. Your choice.