Avoid ending up like a friend, who used all the money he has to invest in bitcoin and also took a loan, promising the lender that he will pay back when he gets paid in a month, after a month he never received the salary, I warned him doing this, because he has no doubt mixed investment with 'whatever it takes', is it safe to call this greed? I don't know.
Now he wants me to lend him some money to at least pay the loaner back and later settle me, there is more, now I have to send him some money to buy some food.
You don't have to use all your money to invest, even if you are not married yet or have other responsibilities, the best approach when planning to invest in Bitcoin is to buy with some percentage of the money you earning, maybe through business or a job.
If you do this weekly or monthly you won't feel any pressure, always remember that health is wealth.
The problem is your friend do not realized all of these, instead he invest everything he got and now hes starting to suffer the consequences of his decision, and it seems he wants to obliged you in helping him out from this picture. I dont want to say go on and help him because he needs you now, but instead help him realize his mistakes and eventually learn from it. Then he can understand you if you leave him solve his own problem if thats the only way he will learn.