yes. one can die from a broken heart.Entertaining it, sadness comes. It produces bad chemical reaction in the body, cramps blood in chest, so stroke happens. So, if you lose someone , cry over it and understand that the living still need you. If you loose someones fault, you are relieved. So God is concern more on your positive feelings of love, hope, giving, creating, faith as against hatred, fear, despair. hence his teachings. God knows negative chemical reaction is bad to the body.