You sound like a nice person, and I really want to be as gentle with you as possible.
You seem to spin every rejection into not being a rejection. I really think it's time to move on. The guy you are discussing seems like a nice enough guy and to me it sounds like he is so timid that he is subjecting you to death by a thousand cuts instead of just making things as quick and painless as possible.
I truly don't think he is attracted to you. In a prior post, Sderenzi wrote: "men can't be friends-only with a woman." That's not quite true. The truth is "men can't be friends-only with a woman to whom they are attracted."
I also agree with what that same poster said about this relationship. The best chance that you have is to have sex with him and make it great, great, great. That might get him to notice you.
You must understand that if you do that he will most likely have sex with you and then just move on, but there is always a chance that it could move him over into the relationship category, just don't get your hopes up. At least that way the torture would end.
I don't know how much you know about dating protocol, but in general most things are communicated in subtle messages. This guy has told you so many times that he doesn't want a relationship.
This reminds me of an old joke that I heard about 15 years ago.
When a guy says to a woman "Let's just be friends" it means that he will have sex with you, it's just that he doesn't want to be seen in public with you.
When a woman says to a man "Let's just be friends" it means that she doesn't mind being seen in public with you, but she wouldn't have sex with you even if you were the last person on earth.
Of course there are some exceptions, so no one needs to tell me how their man isn't like that, after all, I'm just talking about human nature in general.
Here is a brief excerpt from a website that sums it up fairly well
IF A MAN FINDS YOU ATTRACTIVE YOU CANNOT BE FRIENDS
Many women want to argue this point and say things like " I have lots of guy friends." Maybe. There are exactly 3 cases [this website] has identified whereby a guy and a girl can be friends:
The guy is gay
The guy does not find you attractive.
The guy already has a woman much higher than you on the ladder
That can be found at editted by STR removed improper forum links.