Tip - Take help from his parents or friends if you must

If it is something serious and you don't think he will listen to you, you should reach out to his parents and ask them to talk to him. Similarly, if it is something you can share with his friends, that might be a good idea as well. However, be careful with what you decide to share and who you invite into your personal life. If it is something that is better left private, you might make things worse by telling others.