My bf lost his phone and used mine to sign into his google account. He also added me as a backup. He now has a new phone and when he signed into photos, he can access all of my photos. ALL of them. (Screenshots, downloads etc.) When we delete the photos from his Google, they also delete from my phone. I removed his account from my phone and also turned off syncing. Nothing works. How can I keep my photos in my phone but stop them from uploading to his Google photos?