Everyday my friend gambles with his money as same with his life and he always gambling throwing away his money for nothing but losing and the worth part of it is he owes me money 
That's a messed up bro. Your friend shouldn't be borrowing money and not paying it becase he lost it in gambling. He should not borrow just to gamble with it. You should advice your friend to think about what he is doing. He then is going to try to win his friends money back with gambling as well.