can someone mirror my iphone

My employer mirrors my work pc and gained access to all my accounts. I had to have a replacement phone delivered to work and had to set it up on a pc so he must have stored my password. No matter how many times I change my passwords he still seems to be able to gain access. And yes I would love to take him to court but don’t know how to go about getting the proof I need. I did not know he was mirroring the work pc until I saw my apps pop up on my screen one day so he must have accidentally hit something that reversed the mirroring so I saw what he was viewing.