How did they turn off the messages from the phone but not the calls? Apple phone

So my boss is doing some shady **** and we think he s sleeping with one of our co-workers who is now sending him videos of us and lying about us. He has an iPhone upstairs which he uses for music, this is his old iPhone. For a while we were able to see his iMessages coming through but he ended up turning it off. We can however see who calls him throughout the day, how did he shut off the messages and not the phone calls? Is there anyway we can turn them back on.

How tf is that any of your business? Maybe you should be fired for invading his privacy.

You need to find a different job, stat.

If the boss owns the business, you really can't do much, if anything.

If he's also an employee of the company,
turn in an anonymous report on him After you quit.