We can't control other people's actions, so it's important to respect his choice to break up with you, even if you don't agree with the reason. However, it's always good to let people know they have a support system and they're not alone, so if you're comfortable then telling him you're there for him if he wants to talk is a helpful, supportive act. If you think he's at risk of harm then don't carry that weight on your shoulders alone, tell a trusted adult so they can help create a support network for him that can help keep him safe from harm.