Unthinkable.

On Saturday a good mates son committed suicide. What do you say to something like this how do you approach it. I must admit it is a hollow feeling and the idea that he was at the start of his life. 17 last year at high school world at his feet. How is it that we can feel so lost and helpless that we do things like this? What was going on for this young man that he thought this was the only way? How can I help?