Why does PFC Canada concentrate on trying to be super frugal to save money, when we should really be focusing on increasing our income

My girlfriend (25 yo) believes she should not have to help with any bills in the house because I make more than her o, my girlfriend started a business 2 years and during that time I made sure I covered all bills, expenses, groceries, etc. It’s been 2 years later now and I gave her more than...