I’ve been able to track my SO using an AirTag registered to me. My SO did not mention if they got alerts, but I was able to see where they were at any given notice with my tag.
Upvoted for the honesty, but god damn, that sounds sinister.
Why are you stalking your SO?
I use something similar with my wife for years (Google Maps location sharing). Just gives us an easy way to know if the other left the house or if one of us is on the way home or something and also we feel safer being able to know if something wrong happened to one of us.