Can somebody please explain the movie "Keith" to me?

So I just watched the movie "Keith", and I really don't get it... I didn't cry, I didn't feel upset, nothing. I'm not really sure what happened (in the movie). Can someone please explain what happened? I know he had cancer... but i just don't get the rest. Thanks!! P.S. Please no... show more So I just watched the movie "Keith", and I really don't get it...
I didn't cry, I didn't feel upset, nothing. I'm not really sure what happened (in the movie).
Can someone please explain what happened?
I know he had cancer... but i just don't get the rest.
Thanks!!
P.S. Please no sarcastic or mean replies... Be nice :)
Update: I know the plot, I just don't get why it's so sad/the symbolism behind it
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