There is a possibility that your friend is rethinking about the winnings he got should not be given to you, because all the capital to bet on the match was entirely from his own money. What you said is right, people will never feel satisfied when they win a game from gambling, they will try again to bet on the next match without your knowledge rather than having to give it to you.
The cycle can only be broken by own effort. The casino thrives on you chasing your loss and if you realize this and accept the loss and make the decision to earn money from your work, save it and not play with it anymore, the casino will have lost its source of money.
That is actually how you can beat the casino but this is something most gamblers cant even think of because the "money making instrument" is right in front of them, why would they leave it at all?
This realization is the maturity that gamblers need to have.