I think titsalina fits you perfectly, so I will go with that one
(speaking of tits....well, your tits, specifically... we need them back in the photo gallery. Please and thank you.).
I agree that if people live together for a long period of time, and of course if they combine accounts, there should be a legal piece to the breakup.
However, I have a problem with the two year mark. That's nutso. I say 5 years for your Canadian approach.
I think that people need to protect themselves when it comes to co-habitating, like your mother did. I know that the plan for myself and the lovely TF was to at some point after she moved in to get the house appraised. Then, at the time of break up/purchase of a home together, we would do another apraisal. At that point she would get half the equity that had grown over the time we lived in my house together.
If you don't do something like that the person moving into the other person's home gets screwed if there is a break up. If they weren't with you, they would have been building equity in their own home instead of living with your stupid ass for years.