Is my spouse using Bluetooth or wifi to access my phone or account?

How can I make sure no one in my home is using Bluetooth or wifi to access my phone or account? I am a new iOS user and have not shared any of my passwords etc with anyone however there seems to be two phones connected to my account. When checking on find my, two devices appear . When I turn off Bluetooth I am told it’s disconnecting devices but I don’t have anything else besides this one phone. No home accessories, headphones etc. A page on safari I never looked up was for pairing Bluetooth devices via freegadget online website. It also has two devices I’ve never connected to myself. I don’t use any of it, so I know that it wasn’t me. I have screenshots of what looks like a screen overlay, two different layers. My phone heats up quickly, and dies very quickly when the person is around me as well. At times A custom Home Screen was also made that I did not make, and the widgets were direct access to my camera. Settings have been changed, and my

icloud settings of “allow access to iCloud on the web” keeps getting turned back on. I could really use some support around this, what’s been done and how to prevent it from happening again. Please and thank you so much