Roommate’s girlfriend moves in without paying rent, sparkling debate about bills and household boundaries: ‘I never agreed to a third roommate’ – FAIL Blog

At a certain point, that stops feeling like a guest arrangement.

It starts feeling like a third roommate, except only two people are paying.

That frustration is understandable. Shared housing works best when everyone agrees on expectations. If one person suddenly changes the living dynamic without a real conversation, the other person is left absorbing the cost, the space shift, and the discomfort of raising the issue later.