Situations like this can teach you a valuable lesson not to rely on someone's promise especially when you are both drunk the night you got the offer.
An example about a friend who spends for an early celebration is very upsetting when he found out he actually didn't win, yet he already spend money for the celebration. I would probably share an amount just to cheer up that friend.
I guess the lesson here is very basic, yet it’s so hard to make it done. Even if we know already that we should not rely on money that are not yet on hand, but you know when you are in the same situation, it’s hard not to trust and expect the money that has been promised to you. The reason why we mostly end up in broken plans, because we always assume that there is money really coming, and that the promise will be fulfilled. This is not just about money matters, but even in life’s opportunities that we always hope to be realized.