You trusted the guy who was a scammer, you have been discussing Bitcoin and other stuff with him and he probably knew you were an investor and had cryptocurrencies. What if he was also a serious criminal who would do anything for money? He could rob you at gunpoint or even harm you only to get access to your funds because he knew you had them.
So, it is much better that you keep these things private and don't let anyone know about these things even if it's someone very close to you because you can't trust anyone in this world these days as you said.
Now that scammer is getting grilled by the police and he'll say anything to get out of there, even if it means implicating other people. He'll say OP was the brains behind the operation and told him about bitcoin and how to use it to launder money. It's best to keep things to yourself. I wouldn't even tell that to the police because they could be corrupt. They could search your place and steal computer hadrware thinking they can get whatever you have stored in there. Many people will see a bag of money with arms and legs when they see you talking about owning bitcoin.