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All signs you have narrated are going in favor of loosing interest in relationship. Accept this. I understand that he has been a great emotional support to you but you can not compel some one to do that. I do not think that people get back in to the same emotions, once drift apart emotionally. Even though, you may try to get him back by maintaining simple relation with him. Do not ask or try to drag him in emotions. If he has to come back, he will come back emotionally. Sooner you accept this, lesser will be the pain.