Introducing bitcoin to your friend isn't a bad thing.Like from what you said he knows you as a person that doesn't show concern for online stuff,so he was amazed when you introduced bitcoin to him.So you felt like showing him the amount of bitcoins you accumulate would make him develop interest it's okay to you because we all know that seeing is believing,some people you don't to show them the bitcoins you accumulate only mere conversation can make some people develop interest while some won't believe till show them the bitcoins you've accumulated.Also it's risky to show people the bitcoin your hodling in your wallet.