Analysis of Grey ghosts of Memories

I  used to think
What if I have lost you
I still have memories of you
I was fool to think,
Memories are immortal
If man isn't immortal
How could memories be?
I was fool to think
I could remember each of times
When we laughed  so much that we cried
I could remember every fight
I could remember every secret
Every regret
Every day we met
But I couldn't
Slowly as your hand had slipped away from mine
Those memories has started to fade
Soon I'll left with just some grey ghosts of those times
I'm afraid to loose to colors
But it's inevitable
To keep the memories alive forever
Just as it's impossible
To keep the man alive, forever.