My question now is that is it wise that I showed him the amount of Bitcoins I have accumulated before he developed interest?
If you do this, you will lose your friend and your bitcoins.
Your friend is going to have a plan with some bad guys to attack you on the streets or break into your apartment at night, tie you up, gag you, torture you for three hours, threaten to kill you your family including your dog or cat, eat your food and then force you to send your bitcoin to a address. When you do, they'll disappear for ever. You'll lose so bad that you would never want to talk to anyone about bitcoin.
If you think that your innocent looking friend cannot perpetrate these things, read this -
Physical Bitcoin and Cryptocurrency Attacks that Have Been Reported WorldwideYou just narrated a scary scenerio here, and there is possibilities that it can happen, because the mind is very threcherous, always pondering on evil thoughts. Ofcourse there are true friends who have integrity and will never betray trust, but because people can change and become wolves in sheep's clothing, therefore it'll be safer not to show them your sensitive financial details. The OP case is quite safe because his friend is obviously richer than him, if not envy can set in and the trusted friend can become his secret enemy that'll plot his downfall. I think that you can only take chances of sharing your sensitive details with only your spouse, because if anything happens to you a second party can access your wallet, else your investment will be lost forever.