Time change, people change, it is difficult to know what changed within these eight years. People response towards their own evlaution of situation, so I guess to understand his response we must firstly know, what is going on inside his head and what trigger it. I don't know whether he had romantic feeling for him, maybe you broke his heart without even knowing it. You can't possibly expect him to wait for you, forever, that is not how things work. When it come to dating I always remeber the metaphore of water and gold. Water are essential to live, gold is not, but yet, gold are more valuable then water, why? Because gold is rare, water isn't. I guess, when you thought you have him, you don't know to charish it, because his love was like water to you and now you lost him, it is too late for you to regrate it. Maybe, you never really loved him, but now knowing him he don't love you anymore, whatever effection you can get from him become rare and become like gold. You have to ask yourself the question, do you really love him, or do you just want what you can't get. But honestly, I think you lost your chance with him, time to move on.