Since you've adviced him on his gambling manners and yet he doesn't realizes that he's an addict even when he has lost all of his income and now indulging on taking loans on the struggling to recover his lost funds, just ask him to check his savings now and then to see the difference and make him understand that the more he's trying to recover that lost is the more he's losing more from his income.
He has lost more than the initial amount he tried to recover in the beginning so, ask me how much does he think he can bet more in other to recover his lisse, definitely he won't have answer to that so, tell him to begin a new life and let the last go if not he'll keep loosing as he'll be accumulating debts to himself.