Good for you and your friend, you made the right decision. Let your friend decide for himself because it's his money, so it's better for him to know what to do with his money. And you will not bear any responsibility if his investment unfortunately loses. Try to give him all the knowledge about bitcoin.
Giving him knowledge about Bitcoin is also the same as directing him to a better place even though the final decision is in the hands of his friend. And since no one is held accountable when a friend loses on an investment, this is where every piece of good advice is needed before making a hasty decision. Because a wise enough decision will provide a few steps that might be better for people who are trying to invest in their life.