The key to making a relationship work is communication. "Cooling off" periods where you don't speak for a few days just makes the situation worse. You are both young. Too young to know how to handle a relationship. You can't get mad and not speak to each other whenever something doesn't go your way or you simply can't get ahold of him when you would like to. Learn to communicate better with each other. Talk through your problems and try to resolve any issues you are having. If you want things to work, try to get closer to him, not distance yourself.