I don't think it's necessarily about wanting to have sex with her and your comment could be a little bit misleading and too brief, kind of rude really.
Maybe he's just shy? Do you think that he likes you? Sometimes it's hard to talk to people we "like" when we've only watched them from a distance. If you want to get to him better then I guess you'll have to be the one to make the moves, try finding out what he's interested in etc.
To love is to suffer. To avoid suffering, one must not love; but then one suffers from not loving. Therefore, to love is to suffer, not to love is to suffer, to suffer is to suffer. To be happy is to love; to be happy then is to suffer, but suffering makes one unhappy; therefore to be unhappy one must love or love to suffer or suffer from too much happiness. I hope you're getting this down.