Imagine that time is so slowed that each minute seems like a day, each day like a week and each week like a year. This is depression. This is how people who commit suicide feel. Take your worst day and envision living it over and over and over, without any break, continuously. This is depression.
Mental illness is often the basis for suicide.
Healthy human beings do not kill themselves. It takes an illness to override that. However, while most people who commit suicide have a mental illness, most people with an illness do not kill themselves. This is part of what makes suicide difficult to detect. But those who commit suicide do tell us.