How to spy on my mans iPhone?

Recently I found out he was on a dating site and he claims he was just on there to delete it. But he won't give me his password to delete the account. We met on this site 5 years ago.
But anyways I was wondering if there was some sort of app or anything like that I can install on his phone in order for me to see what he's typing including passwords. Please don't comment on our relationship. I know dump his sorry but but I just wanna make sure. So can anyone help or tell me how I can do this. The account isn't tied to any of his email addresses so I'm assuming he made a whole new email I would like to see that aswell. So again is there any app that I can install or anyway I can see what he's typing like everything he does. I know you can on a computer because my family does that. But how can you do that on an iPhone?

There are spyware programs that work on the iPhone, but you will need access to his iphone, and often times the software is unreliable and difficult to install and monitor. He might be wary of that attempt anyway, especially if he's computer and mobile phone savy.

Does he have an iCloud.com account? If yes, you might be able to login to that if you have access to his password.

Personally, it's not worth the risk.

He may not trust you, but it seems you sure as heck do not trust him. Any kind of app like that is illegal and an invasion of privacy. Instead, have a conversation instead of trying to be passive aggressive about it.

Wouldn't it just be Easier to get a new "Man"- because You no longer TRUST the One You've Got?!

Make sure? He doesn't trust you. Is that not enough proof? Are you that OBTUSE?

Unless you are actually on his phone then obviously you won't be installing anything on it. Iphones are very secure.

U2 don't trust each other anymore. Why bother?