The point is that the girlfriend is greedy and wasn't even happy that her boyfriend won the bet. She should have taken some minutes to think before acting, what if her boyfriend take the big risk and lose the money? He will still be the one to pay. She should be happy that the guy won his bet. However if the boyfriend is a cool guy and loved his babe I'm sure that he might reason with her and give her more than he borrowed but not the exact amount that she request from him.
Maybe there is not much deep love between them, that is why the lover asked the lover for money. If there was a very good relationship and they had a relationship like husband and wife, then no girl would ever ask her husband for money. Here the girl may not be greedy because she borrowed 10 thousand dollars from her friend, borrowed 10 thousand dollars and won 100 million dollars. If she gives her lover from 100 million dollars to a few million dollars, then she will have nothing because she took 10 thousand dollars from him and won. Here of course, her lover is a partner in getting the money.