@yoyo100,
I don't claim to be an expert, but your fixation on him, his purity of love for his girl, how special he is, etc doesn't sound healthy to me. First, I doubt he is the angel you suggest if only because no one could possibly meet the romantisized standard you've expounded on here. Second: HE IS NOT INTERESTED IN YOU. If he were even slightly interested in you, he would probably lead you on a little, flirt a little, etc while making it clear he was taken, but you aren't even getting that. He's really, no kidding, not interested. Not as a backup girl, not as a part-time fling, not as anything other than a friend. If you can't accept that, you need to talk to someone who can direct your energies in a productive direction.