More perception than experience, and also logic.
Why would a young, attractive woman stay with a much older retired foreigner and care for him until death, if she doesn't stand to get a major payout when he dies? (When she could have spent time finding someone who would marry her and ensure she is taken care of.)
I guess he could be paying her a wage, but that's just the different side of the same coin.
You talk about "liking/loving", so I think you've possibly misunderstood what kind of relationship my comment describes. It's very much a quid pro quo.