You are between and betwixed.
He sounds like he's good friend material, but you don't see him as a potential boyfriend in the traditional sense of the word.
He sees far more than you do.
Clearly friendships go down one road, without crossing that boundary into boyfriend/girlfriend, through mutual respect and boundaries. Not to mention that many solid friendships have been broken when that risk is taken.
You know how you feel, and you should not compromise to keep a friendship going, or to dive into waters you are not comfortable with. And you can't make those waters warmer, by changing a person to be someone who will look better, or be more like a person you would consider dating.
Be honest. He is never going to be a boyfriend, only a friend. Let him know that the relationship will never, ever go beyond friendship. When he brings up romance again, or begins to cross those boundaries, then consider that a friendship now, may also never happen.
To keep the idea going that if 'this' or 'that' were different, you 'might' feel differently, is changing the nature of the friendship, and it isn't likely in my opinion, that if he changed himself, that you would find him any more attractive, or appealing as a person who you would wish to have a loving, lasting relationship with.
Likely part of what is happening is you don't want to lose him as a friend. Clearly set the boundaries, and see if he can respect them. If he can't, then you have your answer.
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