Quote from Thunderdog:
The person in question may consider himself lucky in a way. Some people have to go through a prolonged period of adversity before they find out who their friends are. All else being equal, I think it is better to find out the way your friend did. Assuming he is still essentially the person he was before his newfound success, then his friends did not really change. They just revealed themselves. He now knows what he did not know before. Regardless of the outcome, that is always a good thing.
On the other hand, if the newly successful person's character has changed, then he can only expect that those around him will respond accordingly. Is your friend still basically the same guy he was before he came into money?
Yep. I think his mistake was that he assumed that his friends would be happy for him, and he revealed far too much.

