Dealing with missed opportunities with a crush. What should I do?

Back in February, I searched FB for a guy I used to have a crush on in school. We didn't know each other and I was always too shy to approach him. Five years later, I'm now 22 and he's 24. I added him on FB and he accepted most likely out of politeness. A few months back I deleted him in a fit of confusion thinking that it was weird that I try to make connections with him, I reasoned that I barely knew him in school and it was ridiculous that I should attempt to make friends now. I tried to put him to the back of my mind and move on with my life. For a month or two I did, but now the thoughts of him are back. I really regret not doing anything about it when I had the chance at 17. He's the only guy who's ever not known the way I felt/feel about him. I know that rationally this whole situation is stupid and should remain firmly in the past, but it's been 6 years and I cannot forget him.

I can't re-add him as that would look odd. I know that this whole thing is utterly irrational but it is breaking my heart. What should I do?
Dealing with missed opportunities with a crush. What should I do?
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