Hello,
me and a friend working together in a business which involves crypto currency.
This is the wrong approach, 2 people and one wallet for cryptocurrency, you never know what your friend can do with your coins, anytime.
Agreed^^. Even if he has a hardware wallet and you don't, don't blindly trust someone with your money to keep. After reading the whole story, I find your friend to be the culprit. There is nothing you can do now to recover them.