My (straight) roommate in Los Angeles was dating a woman who got herself into housing trouble. She bought a dog for her ten-year-old kid (from a former relationship), knowing full well that her apartment had a strict no-pets policy. Her landlord found about the dog, inevitably, and was kind enough to tell her to get rid of it rather than simply kicking her out.
She ignored the ultimatum, figuring that the landlord wouldn't follow through. She was wrong. He evicted her, keeping her security deposit, of course, and took her to small claims court to force her to pay for recarpeting the apartment. So she and her kid are out on the street with no money to pay for a first/last/security deposit on a new apartment.
So, of course, she begged to be allowed to move in with us, with her sharing my roommate's bedroom and the kid sleeping on the hide-a-bed in the living room. I reluctantly agreed, with the understanding that this was only for a month or two, long enough for her to build up a cash reserve and find her own place.
Fast forward four months and she, the dog, and the kid, are still there, and she hasn't paid a dime of rent. So I ask her how the apartment hunting is going. She hems and haws a bit and it becomes pretty clear that she really likes the sweet deal she has going on right now and that she has no intention of moving, or of contributing.
So I talk to my roommate and he says he doesn't like it much better than I do but he's too much of a wimp to kick her out because she is his girlfriend, after all. If I want her out, I have to be the bad guy.
Fortunately, by this time I no longer have a problem with being the bad guy, since I'm fed up sharing a small two-bedroom/one-bath apartment with my roommate, his dog, her, her dog, and her child. So I gave her notice that she had to be gone by the end of the month. She immediately went running to my roommate, who (truthfully) told her that he couldn't do anything about it, since the apartment was in my name.
For the next two weeks, she worked on both of us with everything she had. None of it worked on me but she finally convinced him to move out with her and pay the bulk of the money necessary to move into a rented house, at nearly double the cost of the two-bedroom apartment he had been sharing with me. So his costs didn't just double, they quadrupled, since she still wasn't paying anything.
All I can say is that I hope the screwing he was getting was worth the screwing he was getting!