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.
answer this first ..
what makes you think that there is a need for you to convince him to invest in bitcoin? just because you are an investors?
now that you are having a doubt so you understand that blame might be yours once he fails?
though it is bitcoin and the chance of failure is very tin , yet you knew that it is not your money to be concern for.
you have done your part mate, after telling him everything he needs to know then let him the one to decide.
and besides surely he will contact you once he is decided.