Most Helpful Girl
Be shuttle. Don't be annoying but give him tiny gestures that you care and are sorry. Don't completely leave him alone to a degree he thinks he is not wanted. Give something he loves. If you did someone really bad try to sort things out and have a serious talk. Other wise don't worry just follow the things above and try to put yourself in this place.
Most Helpful Guy
Tell him you're sorry for whatever you're sorry for and tell him that you understand if he needs space and then leave him alone and wait for him to come back to you when he's good and ready.