Essentially my best friend at university's loser boyfriend moved in to our 2 lovely bed in our final year, and stayed for three months non-stop. They didn't bother to look for alternative accommodation for him/half-heartedly went to a few house viewings and basucally took the piss. He then found somewhere cheap and crappy but still would cook, shower, watch tv at ours... I did try multiple times to approach this but she developed a really thick skin and because it worked for her, seemed pretty happy all round. (I wasn't!)
Since then, they have parted ways but are still in touch. I have since found out that he's bought a fucking flat!