good mourning.

mourn   [mawrn, mohrn]
–verb (used without object)
1.to feel or express sorrow or grief.
2.to grieve or lament for the dead.
3.to show the conventional or usual signs of sorrow over a person's death.
–verb (used with object)
4.to feel or express sorrow or grief over (misfortune, loss, or anything regretted); deplore.
5.to grieve or lament over (the dead).
6.to utter in a sorrowful manner.

does someone have to physically die for a person to mourn them? no. no i do not believe so. it is selfish, of course, to mourn the living. because rather than being happy the person you love is still alive, you are sad that they are not with you.