For me my depression stemmed from several years of abuse and neglect. Even if the abuse and neglect was over with years ago, the damage has been done.  I struggle with self esteem issues and sometimes when a situation or someone comes up that reminds me of the abuse I endured, I go back into that black hole of depression and wanting to die just so I don’t have to deal with the pain anymore.  It takes years for abuse victims to stop being depressed.  I give myself maybe another 5-10 years of being abuse/neglect-free to finally stop feeling like I’m back in childhood suffering.  It pisses me off to no end when people cry about being depressed and they NEVER went through abuse or situations that actually causes depression (aka living in oppression, war torn countries, being in a cult, having their lives in danger, etc.)