When a loved one is no longer with you, recognize your grief as the expression of your love for them. When they were here, you could hold them and express your love. Now that they no longer present in physical form, you feel their loss and begin to grieve their absence.
As your love would last for a lifetime, so will your grief. The pain subsides and your grief slowly becomes a part of your life. You remember and smile through your tears. You begin to find that your grief is a welcome part of your life. You realize now that you grieve because you love.