One of my friends has fallen in with the wrong crowd. How can I help them see that his new friends are nothing but trouble?

He is staying out all night partying. He is skipping class, missing practices and very distant towards us since meeting them. His whole attitude has changed and i am worried about him.
We try talking to him voicing our concerns but he gets angry with us he feels we are jealous that he has friends outside our group but that's not the case. We are just worried.
I want to help but can't get through to him.
One of my friends has fallen in with the wrong crowd. How can I help them see that his new friends are nothing but trouble?
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