Scam and adultery

Hello, I have my suspicions about the double life of my partner , who is also my collaborator!
I may have to make up my mind but I can’t suffer a financial scam that could destabilize the future of a company!
So I’m looking for information! No procedure afterwards so it’s just me! I’ll write off this toxic relationship later on, but I need to know for sure first!
I would need over a short period of time to have access to the latest generation iPhone type phone,
mainly the WhatsApp Messenger app, maybe the photo folder?
I would like to point out that it is possible to ask him to install an application
(only if it is very discreet!) as we collaborate together remotely
if a control app is disguised in the name of the company, it is quite possible to give a download link … I would like to point out that we reside in Two different European countries
Since I already know a lot of things about life and I see this person suspicious of everything,
I think I’m being scammed!
Local private detectives ask me for huge sums of money for information that I have to give them and that I have already found myself! so they won’t be enough for short periods of time to give me a result
I hope to find a final solution here and move on! or tell myself that I can continue with certainty!
Here is a brief description for this first contact, I remain available to answer all your questions !
Thanks in advance