Hello dvvill,
Thank you for using Apple Support Communities! I understand that you're receiving a location-based reminder that you didn't set up, and appears to be for your boyfriend. I would be happy to help take a closer look at some potential causes with you.
The next time this reminder appears, I'd like to have you locate the Reminders list the reminder appears under, then ensure that it's not shared with your boyfriend:
Use Reminders on your iPhone, iPad, or iPod touch - Apple Support
- Tap the list that you want to share, then tap the more button
. - Tap Add People.
- Choose how you'd like to invite people to your Reminders list. You can use a built-in iOS app or a third-party app.
- Add the people you want to share the list with, then send the invitation. The steps for adding people and sending vary based on the app that you use.
After someone accepts your invitation, they can add items, delete items, and mark them as completed. To view shared Reminders lists that you create in iOS 13, the people you invite also have to have iOS 13 on their device. Notifications that you set for your reminders aren't shared with anyone else."
You may also want to take a look at the devices that are currently signed in to your Apple ID following the steps here:
Check your Apple ID device list to see where you're signed in - Apple Support
If you don't recognize any of the devices signed in to your Apple ID, be sure to follow the steps under the "Remove a device from the list" section. Let us know what you find.
Take care.
