>>5 You don't need to apologize or even feel embarrassed about it.

I personally think you should give it a try. Sure, your affectation for him is not based on anything of his character, but it's a powerful feeling you have inside of you, and it would be a waste not to act upon it, not to mention that if you leave it as it is, it will continue to block your life. And who knows, perhaps the guy is awesome for you, and it even clicks together?

If I were you, I would just write him a letter (using your very own facebook profile, mail or whatever, don't use a fake account), in which you explain to him that you have been crushing very hard on him (you can tell the whole story as you posted it here), and that you would like to invite him to meet at least once. Tell him that even if he has a girlfriend, or is not in the least interested, you would still like to meet once to talk a bit, reminisce of old times, and bring closure.

You have nothing to be ashamed, on the contrary. It's a pity that you did not act before on your feelings, but as they say, better late than never.