It seems we may just have different morals that no amount of back and forth will rectify. I apologise for sounding like a broken record but I'm responding to several people with similar arguments and memmy ain't as good as keeping track of context as Apollo was.

I actually live this scenario and have an equity agreement that splits the sale proceeds proportional to what each person put in. I find the idea of land lording over a partner to be disgusting.

If you want your girlfriend to live with you then what's the alternative? She move out and buy a second house? If you want her to live with you then she shouldn't have to put her financials on hold to do so.

But I agree that it's case by case. In several other places I've said that I don't expect their recent girlfriend to get a cut of their boyfriend's house just because her lease expired when they started dating. The longer she lives there though, the more I think the conversation should be had.