Yes because you don't need to get involved. As far as he knows you were still friends and regardless if you had a good enough reason to get him locked up, it's still betrayal since you took advantage of the trust he had in you and got him arrested.
@jb681131: "If he hid his criminality from me, that means he hid something from me, it's against friendship"
And how in the shit does that work? So now every time I make a friend they gotta know everything about my life and I can't have any secrets otherwise it's against the friendship?
The definition of betrayal isn't reliant on your friend's moral compass. If my friend told me he murdered someone and I turned him into the police, then yes I betrayed my friend. I betrayed my friend for a very good reason. I'm am not going to try to change the dictionary definition of a word, just to convince myself I am a good person.
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