How can I open my husbands Messenger without the password,?
There is not way to do that. I would strongly advise against doing that for various reasons, but you cant. If you wanted to, you would need to install the messenger application at the very least. If you wanted to hire a hacker (again, not recommended) you would need to pay. If you were not going to pay a hacker, and didnt want to install the application, you would need the password. With these three conditions, there is no way to do what youre asking to. Even if you reset the password, you would arose suspicion. You shouldnt need to open his messaging app without his permission though.