You have to be patient. Be friendly and pleasant, but not pushy. Try to show him that you are a kind person, and interesting to talk to. Talk to him when you can about school, sports, music, movies, books, hobbies, special interests, friends, family, pets, events that are happening around you or in your town, anything that might be of interest to him. Ask him questions about himself. Help him if he needs help. Show interest in the activities and issues that interest him. Pay attention to him, listen to what he has to say. Smile. Make eye contact. See how things develop.