Living on assumption and promises is more like spending money you haven't received. People can make promises but how sure are you that the promise will be fulfilled.
I will give you #5000 on Monday, how sure are you that the money will come in on Monday? Promises and assumption has caused alot of people there job, imagine leaving your recent job because a friend promise to get you a better job. This may even cause someone his/her life if one base most of his/her lifestyle on promises and assumption.
Relying on someone is similar to having an illness that you don't know how to treat or cure; instead, you rely on God. Depending on God, the ailment may go away or continue to exist. When someone promises to give me money, I can't wait, and when someone promises to offer me a job, I can't wait because I don't even know if it will be possible or not because a promise is just a decision and someone can change their mind at any time.
I could remember when one of my friend put himself into serious debt believing he has already won a huge money from gambling. This was some year ago, match between Besiktas and Benfica. It was the last game of my friend's ticket. After 3 goal ahead by Benfica in the first half, he believed the game was over and Befica has won. He called us to celebrate. We started drinking and eating at a bar to celebrate this. After the end of the game, we were shocked as the game ended up in draw with 3- 3. This landed my friend into serious debt that took him some weeks to pay.
Your friend committed a grave error by putting his faith in a common gambling game. You cannot rely on gambling and incur debt, so why would your friend want to do both? Instead, he should have waited to celebrate his victory until the game was over. He was impatient and believed that the game must end soon or the opposition would not score. These are only predictions that he can't be sure are accurate, but I think you've learned your lesson by now.