You could buy him a cheep gift or maybe some candy and apologize. If it was an accident you just need to apologize and move on.
Answer:
Step-by-step explanation:
Tell him that you are very sorry and that if he doesn't forgive you, you understand because he used those headphones all the time, but when you tell him that give him another pair of headphones, but go to walmart or something, they have really good working headphones at walmart for cheap.