Why and how did my phone link up to my moms car?

I drove my moms car is a 2017 Honda and it’s a pretty cool car for a freakin honda. Somehow it’s linked itself to my phone..and my phone now tells me when my mom parks her car and gives me the location of her car.

I didn’t try to link it to Bluetooth I never even pulled my phone out of my purse when I got into her car. Somehow it still linked itself. How do I unlink it? It was pretty funny at first when I called my mom and asked her why she was where she was and she said “how do you know where am?”

“Your car told me.”