If you would had lost your father/mother,

when you were a child. Then it is painful but ok because you would have developed the habit or the mental condition to live without father/mother.
If your father/mother were there but they did not love or concentrated on you much as you feel, though it is not possible then also it is ok, you would have practiced to live a detached life from your father/mother and let him/her allowed to love her other children elder/younger than you.
But the memories of loving father/mother, is very much frustrating, depressing when you lose your father/mother, who loved you a lot in their lives, spent quite a long time with you.
So, we must love our children, people very much internally, but at the same time we must try to develop a habit within your loved ones to enable them to live, survive without you, without getting frustrated/depressed. For this you may have to act rude, go away to some other place, non-communicative for a while for them to be detached from them.Otherwise they may disturb their personal/family lives in your memories.

Because we must always remember that the world is mortal and everybody has to leave this world within specified time.