My question now is that is it wise that I showed him the amount of Bitcoins I have accumulated before he developed interest?
It is never wise to show your wealth to others, your friend has been away from you for a long time. You don't know what's going on in his mind. So, I think you shouldn't have shown him your bitcoins.
One more thing you said, you encouraged your friend about Bitcoin, but you should have told him about the disadvantages of Bitcoin. Because Bitcoin drains as much as it benefits.