Does your non-married significant other split living expenses 50/50 with you?

Caught a video on social media (a viewer wrote in to the host) where a woman (29 years old) has been dating her boyfriend (33 years old) for three years.

He is a homeowner and has been paying the mortgage for the house the last 7 years. He lives in the house by himself. His girlfriend lives in an apartment by herself. They mutually agreed that they wanted to move in together. (She would move in at the end of her apartment lease and not renew the lease)

The girlfriend basically goes on to say she only wants to pay for minor bills such as utilities, groceries, etc... but the boyfriend wants them to split the living expenses 50/50 (including the mortgage).

She is up in arms about it, stating that she shouldn't have to do that because she has no stake in the house and would gain no equity if they broke up and she moved out. She even goes as far as to suggest they sign a contract where she is paid back the balance of the contributions she makes financially should they break up.

The comments on this video seem to have large amount of people who think the 50/50 request is unreasonable. A lot of people said they would rather pay MORE to stay in their apartment than move in with their significant other and pay LESS if it meant they had to contribute to the SO's mortgage.

I don't think the 50/50 split request is unreasonable.

Who is the irrational individual in this scenario?