why why why!!! they leave whom we loved so much?

Life's really like that. People will die sooner or later. It's just because we love them that we feel that they left too soon.

Though not very clear, I guess you wanted to ask us, Why the beloved people pass away or leave us alone. If I not wrong, let me tell you that, A love still could be continued to your intimates even if they leave you alone. The life is just like this, and we have to accept it as is bestowed by the nature. Whatever borns has to end is law of nature. Forgive me if am not relevent to your intentions, because your discussions looks little brief and incomplete in explanation.