How about, why are they planning on moving in after a few months of dating? Maybe give it some more time before any of this even is a question.

So, she gets to pay less in rent than what she does currently AND gets to live with only one other person as compared to the 2 she is sharing her living space with and the complaint here is ONLY because he makes more money? Some of y'all are such greedy humans.

Then she can stay in her place with more roommates she has no connection to and pay more every month, and he can find someone who made better life choices and is closer to his earning value. He shouldn't settle for less than hes worth, afterall. She should date a guy who makes similar income to her. Why does she deserve a guy with a much bigger income?

I dunno. He signed for the mortgage being fine with paying for it all. If she moves in it’s only fair to pay a fair share while living there.