Response to Richard Cory

After reading Richard Cory just the one time it was pretty easy to develop an impression of the poem. There was a rich guy named Richard Cory and everyone in the town wanted to be like him because of his money and success yet nobody knew he'd kill himself that night. The first thing I thought of after reading this was that money can't buy happiness. A question I have would be more directed towards Mr. Cory, why would someone so successful and wealthy want to end his life? I remember a quote and i can't remember where it's from so don't accuse me of plagiarizing please but it said something like "sometimes the saddest people are the ones with the biggest smiles"