I think you should talk to him before showing him your arms.
I don't know about everyone else, but when I see another person's scars/cuts it can make me really triggered, so it might not be the best idea to show him.
Just sit him down, and basically tell him everything you would have wanted to hear when you started self harming, and make sure he knows you're always there for him, even if he says he isn't self harming. It's good to know someone cares about you no matter what your situation is :)
If he's been depressed lately then it might be good for you to talk to him anyway. Maybe you could start the conversation by just asking how he's feeling and how he's coping. That way (although it's unlikely) he might even open up to you and admit that he's been self harming.
Good luck :)
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