Accessing phone remotely and with a virtual Bluetooth and an app

Well first I want to say if someone can tell us the solution please tell me. My phone does sone funny unexplained things with security issues my bff ex boyfriend is in her phone all the way he originally had Apple ID and password but any new device she gets or goes with a new company etc. he is in her phone the minute she gets in her car and sometimes she Leaves the phone at store after first getting it so the workers can see. She can’t get in her settings at all can’t download any apps can’t use web. He controls if we can call each other or not disconnects us shr has proof that he left sometimes if he not paying attention she can see what he’s doing in his so she has flash drives of proof Apple couldn’t help they said go to authorities which she is a procrastinator and just cries and fusses about it it has consumed her life made her lose a teaching job because she can’t get in any of her email addresses he’s even in her home phone and internet can someone please she’s sone light on how he’s doing this and what can she do?? She said something about Apache it’s things you can do with apple devices but they use it for bad to cyberstalk and whatever other people he controls if her car locks or unlocks she’s been locked out her car she can’t use her phone and she’s been stranded before it’s a living nightmare please someone help any kind of device she gets whether it be android or iPhone andlobis now i her laptop he’s never been around any of these devices and she’s changed her number her Apple ID but he controls her original one and any email or Apple ID he gets in