Oh wait I sort of get it now having read the rest of the topic.
I have a friend in the same position as your friend.
I just don't see him much and I don't care. When I do see him it when me and other friends show up at his work (the c*** doesn't work there though) and give him a hard time. Oh well. He's too easliy brainwashed to see how unhappy he is. Nothing I can say will change that so I just stopped giving a s***. We were actually roommates too when he met her and pretty much move her in without really discussing it with me or our other roommate. The b**** walked in like she owned the place and thought she could boss us around and rule the roost without even paying rent. She seemed to have a "lol I'm a shrill-voiced b****y, unpredictable alpha female! I have my new boyfriend wrapped around my finger so his buddies should be just as easy to control ^_^" attitude. She chipped in equally for utilities, but not rent, and then second we got into an argument in which she uttered the phrase "I pay rent," she found out that she had misjudged me. I didn't flip out on her, I only raised my voice, but our other roommate who is more alpha than I am had already yelled at her and had tried to keep me from getting involved but couldn't. We each had 2 explosive fights with her in the following months (during which our friend, her boyfriend hid in their room to avoid being involved).
Some people should know better and if they don't, they need to be taught.
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RIP Caelus, 8/1/01-2/28/11
The old account had to be retired :D