So should I go ahead and advise him to buy Bitcoin or I should leave him to come to me himself? Because he will buy it if I ask him to.
I can perfectly understand how you feel, simply because I've been in a similar situation before, long time ago around 2017 or so, when I was still pretty new to crypto, I still had some guys who looked up to me for advice on what to invest in, and would pretty much invest in which ever coin I told them to invest in..
Nowadays, the number have more than trippled, but I don't do that shit anymore, I know better now from experience..
I don't advice no body on what or which coin to invest in, not bitcoin, not any altcoin, you are solely responsible for your decision, and if what ever you decided to invest in doesn't go well as you envisioned, it's not a burden on me to feel remorseful for you, and you are solely responsible for your loss, not me.