Indeed so confusing your story. Well, sooner or later you will get tired of this and will take a decision to move on. Life is too short to live it this way. I see you can already be "a just friend" for him as long as he doesn't open his door to you and you will have all the right to do it. Then, you will check how much is he attracted to you. Otherwise, if nothing from his side happen to make things clear between you, then my dear this man wouldn't be for you whatever the reason.