My question now is that is it wise that I showed him the amount of Bitcoins I have accumulated before he developed interest?
Maybe it's smart because you no longer share your wallet seed phrase with your friends. It might not be wise if you were to share your wallet password. Like you, we may show our friends how much bitcoin we have accumulated. But anyway if your friend can invest one btc amount in the way you educated your friend about bitcoin and as told then your friend's next life will be very happy and peaceful.
Motivating friends to invest in bitcoin is a much better way. start teaching them about the benefits of bitcoin for the future, by introducing them to the history of bitcoin, both the history of the bitcoin price and what the bitcoin halving moment is. So that makes them interested in investing in Bitcoin. Showing your BTC investment amount to a friend may depend on you, if he is a close friend it is okay, this will increase his trust in Bitcoin. but if he is not a close friend, it is best not to show the amount of BTC in your wallet. Sharing seed phrases is a stupid act, especially with friends, it's better not to share them with anyone. Because it's not permissible to even share with friends with one of your family members, unless you really believe it 100%.