Notice how you act when you win. Some people get worse at being people.

Success loosens things that were being held in place by needing other people. Winning can make you quicker to interrupt, slower to help, more certain that your opinion was the reason, and none of it feels like a change from the inside because it all feels earned. Character shows up more clearly after good news than after bad.

After the next thing that goes your way, watch how you talk about the people who lost and the people who helped. Say their names. If anybody has got quieter around you lately, that is worth asking about.