Ironically enough I one of my best friends just ended things with his cohabitating gf last night. It'll be interesting to see how they solve everything. Last night he went to sleep at his moms house so they weren't in the same place. Now he has to figure out how to get her out of the place. His biggest problem is that she was living with her grandparents before they moved in together and when moving out told them my friend and her were getting married to quell their worries.
He pretty much paid for the place and other expenses of hers while she's been in school so she doesn't really have a place to go. This one's going to get interesting.