I went through something similar, on the other side. He wasn't someone I ever actually dated, we both just sort of liked each other but never admitted it to each other (mutual friends knew though). I went through a depression and tried to find him on facebook, I just wanted to explain some things, I guess.
Anyway, I sent him a message but he never responded, but I think it's a good thing. I think the phrase "what if" is one of the most damaging in the English language.