Analysis of The book

A man I like wrote a book, gave me a copy to read.
I found it quiet enjoyable until I came to the lust and greed.

Was this the man I thought I knew?
Only fiction on the pages, nothing that was true.

I could be wrong but it left me cold,
Could the writing be revealing a window to his soul?

I looked at him differently than I had before,
I didn't want to judge him,
That spirit I deplore.

But could there be a lesson for me?
Be careful with your heart
When it's there for all to see.