Because he's been using the time trying to get her back into work and earning an income..Then why isn't she taking care of the home? He's mentioned they share cleaning, cooking responsibilities. He has to do most of the shopping etc. If she was a slippers and whiskey in hand when he got home and everything from cleaning to admin was done. I'm sure he would have been happy.
He might have experienced a close call with the coof that made him realize he's in this alone (provisioning) for the both of them. It has probably skrikked him a bit.
He should rather have told her what she needs to do around the house, otherwise she can GTFO.
"You want to stay at home all day sweetheart? Sure you can! Just make sure to do the shopping, cooking, cleaning, ironing, and and and....I'll take care of bringing home the bacon."