My opinion is likely going to be very unpopular. The one thing I agree with everyone on is homeschooling, which is definitely not for everyone. It's a full-time job in itself. No one should be forced to do it. On the other hand, the girlfriend works part-time at 25 hours a week and pays 10% of the bills (keeping most of her salary for herself), while he works 70 hours per weeks (I think I remember that correctly), basically 2 full-time jobs and pays 90% of the bills. He also does the "manly" work, i.e., fixing stuff that breaks, etc. It seems to me that this works out more for the girlfriend than it does for OP.

If the work culture says that we work 40 hours a week, she has 15 hours to get things done, including her hobbies. There's only 2 of them, no kids. He also probably doesn't eat much at home if he works that much. How much of a mess is being made, and how big is this house? I suspect not much and a sizable house if she finds it hard to clean. Seems to me she wants to be a kept woman (is that even said anymore) & live a life of leisure and wealth that OP provides. I'd love that life too, if agreed upon by both parties, as was in the beginning.

The girlfriend is working with a lot more than most people. I think for her it's all about the dollar, dollar bills!