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You don’t really understand what has happened or who he really is. Without information as to what Narcissism is, it is almost impossible to understand:
Why there seems to be 2 completely different people inside him?
How he could have changed so dramatically?
Why he is so nice at times and then so nasty at others?
What causes that [...]

Here are some warning signs that a person you have met or are starting a relationship with may be a Narcissist.
He may blame every error of his, every inadequacy or mishap on others, or on the world at large.
He may be hypersensitive to ribbing and insults. He may treat children or animals with little care [...]