And, I don't really know why. I know that it was not my fault. I know that I did all I could have done. I know I was supportive. And, like always I find this question hard to answer.
Depression is found to be the key to most suicides.
Some people are more genetically disposed to depression, and thus makes themselves more prone to suicide than others. I know that my best friend was depressed. It showed in everything she did. When I think about her, I feel sad and worthless. I should have been able to prevent her death.