She’s not renting though as there’s no rental agreement. She’s just throwing money into the equity. This is a relationship, not a landlord tenant arrangement.
It doesn’t matter if there isn’t a written lease. Its still very much a rental arrangement. No law enforcement will hold her liable for being a homeowner. No law will compel her to pay for a new roof for his house, should it need it. In fact, if she’s been there more than 30 days she’ll likely have many legal protections a renter has, such as protection from being thrown out without formal eviction.
It doesn’t matter if there isn’t a written lease. Its still very much a rental arrangement.
That’s sorta the issue. You shouldn’t treat your SO as a tenant.
I would hope you treat your SO as an equal partner, but that also means healthy boundaries equal to where the relationship is at the time. If one doesn’t pay rent, but pays toward the mortgage, and you break up instead of getting married, do you expect the home owner partner to cut the other partner a check to cash them out of their “equity”? How is that fair to the homeowner?
Then please complete your argument. One person is contributing money into the equity of the house without ownership, and I believe you’re arguing that is unfair, because the homeowner its benefiting.
What actions are you proposing is fair to the non-homeowner that doesn’t make it unfair to the homeowner?