For me, I will use the half of money to play because we do not know if I also luck like him. Then, I will keep the half of money in my wallet. Maybe, my decision is just like a win win situation, because despite of losing the half of the money it is okay since I still have some money left from what he gave me. But, the best decision is keep it and do not use it to play again.
That is actually the strategy where most people win in the gambling. It is not in the game that you win, it is in the decision on how you manage to get the most out of the winnings you've achieved. My strategy is like this, I play depending on the time I've alloted, and I've already estimated how much I could spend, merely, for a 5 minute game per day, It doesn't matter for me if I lose or win, as long as I know I can control my money for me to not lose too much. Because for us, the greatest lost is when we are hit by our defeat psychologically so why to bet too much.