How do you say goodbye?

Ow do you say goodbye?
to someone who is about to die?
to the person who kept you alive
or else you would of made the dive
to someone who is being stalked by death
watching her struggle to take every breath
while she is waiting for a heart
she only has six months before the depart
knowing that after that I will soon pass
then you will find me under grass
for without them there is no point in life
so soon my best friend will be a knife
I pray to get hit by a bomb
so I don't have to say goodbye to my mom