I'm going to give the police information on how my friend committed a crime.
Why are you going to turn your friend in?
He can't be trusted. I think he will just continue committing crimes.
That's a difficult situation to be in, but you should think hard before turning your friend into the police. If they only committed a minor crime, you could be causing them a lot of harm for only something small they did. You should maybe just talk to your friend first to see if they can change their ways before you resort to contacting the police.
Fuck that. He can't change the way he is.
I am not sure what your friend did, but if it was something small, you should really reconsider. Think about the issues and financial costs you will be causing them if you turn them in. If it's a serious offense, then you probably should turn them in though.