Ask HN: How do I prevent stalker ex's from tracking my physical location

I have an ex who has a penchant for finding me. She claims she found me because of location sharing on my iPhone, but I double checked almost all the location settings and see everything looks disabled. Is there a full list of settings that I can run through to ensure she isn't able to find me via some rogue app leaking my current location? I didn't post any images with location meta data either. I don't have sharing on in Google Maps or Apple Maps. She's not listed in "Find My" or the other obvious IOS app settings. I'm truly baffled how she is able to find me. It's also quite frustrating, because there are like 50% of the apps that need location data, like I can't just turn if on and off every time I need to use Uber or my bank (which requires it for fraud detection I think). There are so many apps that have some good/bad reason to justify not just blanket turning off location data in a lot of instances and it's quite frustrating. Any general tips, lists of things to disable, etc would be greatly appreciated. Also, I'm concerned it's possible she may have installed some app that's quietly tracking me when we were together. I see many apps out there for sale that claim to do this. Wondering if people have info on those and how well they actually work and can stay hidden.