Take the following as truth: Her only hope, if she is unhappy with the perpetual houseguest, is to advise the (official) roommate that 1) the threesome is not a comfortable arrangement for her, or 2) the guest is a de facto resident and should share the expenses--to the tune of one-third.
Then the following statement: "Threesomes often are awkward and can end poorly." is true, false, or inconclusive?