What is a good reason to cry? COuld be anything really. Grief of some kind is indicated but whether it's depression would need far more information or you could just go see a doctor and find out.
I have been told that people who do themselves in do it when they've stopped crying. SO I guess it's good that we cry (and I do mean "WE" cause I cry daily, too) I'm only living for the day when the tears stop