OP I am as baffled as you presumably are why some PP are determined to paint your relationship as controlling.
My DP and I also have location tracking on each other's phones. Neither of us have anything to hide and it's occasionally useful:
If we're meeting in a park and I'm not glued to my phone he can just see where I am and meet me.
If he's driving back from work / visiting someone or something I can see how close to home he is to prepare dinner / understand if he'll be home in time for the kids bedtime, without hassling him and making him text while driving.
If he's gone to sainsburys I can quickly check if he's left the shop yet and therefore estimate his Eta rather than calling or texting and either interrupting his alone time or having to wait for him to check his phone and reply.
This is all healthy and an advantage of modern technology IMO. I live a relatively low tech life (I don't drive, we don't have any Alexa etc, no Smart doorbell or heating) but this is one where I make the most of modern tech!
It's hard to read OP's tone on the Internet but there is nothing in any of OP's posts to make me think the relationship is unhealthy, so it is weird that people are so keen to say it is.
As for this mystery... To me it seems its either a random weirdo trying to stir trouble, a patient fixated, or an affair gone bitter. I have no idea which is most likely, but for OP's sake I hope its not the last of these as OP sounds lovely and like she had real faith in the strength of her relationship, and I'd hate that to be misplaced.