Maintaining Home in 2024

TurboTax asks the question, "Did you maintain your home in 2024?"

Individual owns a home

Mortgage is in the name of the same individual 

The same individual has a Fiance resides in the home 

Fiance pays rent to this individual an amount which is identical to the individual's mortgage payment on a monthly basis

Both pay household expenses equally - so the answer to the question is Yes?  and  No?

The noted individual does NOT have a business in the home

What is the implication if the Fiance (who is not the home owner) pays, for example 60% of the houshold expenses and the individual homeowner pays 40%?   Should the Fiance answer that he maintains a home even if he is not the homeowner?

Or vice versa - -- 

What if it is determined that the individual maintains the home and satisfies more than 50% of the household expenses (but again, does NOT have a business in the home) - what is the implication to the individual?  what is the implication to the Fiance when he files his own tax return (Single)?

Help!

Thank you.