In some countries and states, a concubine (party in an unmarried couple) may over time acquire some rights over property or assumed (shared) income.
The OP's question, while marred by other considerations many seem to have addressed extensively, is thus legitimate.
I am not a lawyer and I think the most appropriate person to answer to the OP's worries would be F. Guzman. However, I seem to remember that the question has popped up in the past and that the the answer was that a concubine does NOT acquire rights over property over time. On the other hand, it would seem that in recent times, my memory has somewhat failed me when it came to remember "consensus opinions". So OP, until you get legal advise, try to play around with the SEARCH feature of this forum.
I would also think, that the OP, being a home owner and apparently living here and having a "relationship" with a local, would be well advised to retain an ongoing relationship (professional) with a legal counsel. Your lawyer would be best suited as to recommend you how to keep your assets clearly separated and protected from your "romantic partner".
However, the OP should also keep in mind that locals have a very ego centric interpretation of laws and justice. When things go bad, they will always be quick to suggest themselves to the point of total conviction, that they are OWED at least part of what the "other" party has, had or shared. This conception can lead to reactions which can be way beyond just legal actions (arguments, rage, threats and even... their fulfillment!!).
If you put something (like a vehicle) to your "partner's" name, even if it's just on their recommendation so to make things "easier" and limit "paper work" or legal procedures, IT will be almost impossible to claim those assets back!
Besides the sentimental and health considerations already brought up by other posters, I think that your physical security is something you should always keep in mind first.
... J-D.
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