Yes, 'in my silence I adored you'...essentially means that the man has adored the girl for quite some time but has never had the courage to verbalize his feelings toward her. 'I adore you in silence' is more poetic than common usage.
Does 'read' mean (the girl) reading the note attached on the string? Yes, the man is still incapable of verbalizing his feelings to the lady he adores so he is going to try to capture her heart with a written note.
Isn't love silly?