That...isn't what happened. He has his routine. That routine includes some amount of "family time", whatever that means. It is probably one they have discussed before, in ensuring that their mutual needs for companionship/childcare vs alone time are being met. The plan he came up with would cut into that time. Rather than just make that change on his own, he talked to her about it, ensuring that she was also on board with the tradeoff. That's called "a healthy relationship".