Is there ANY way to get into someone's facebook account?

[Kittysue]

Without having access to his computer or phone it's impossible. Next time he's in the shower, just check his phone. I doubt he logs out on his phone and most people stay logged in on their computer. Or you need to have access to his computer to install a keylogger - but you will need his login information anyway to get on the computer in the first place
All of those Facebook hacks you find online are scams and usually infected with Malware. If you tried any of them you need to download and run Malwarebytes (free version)