After he leaves , Belmonte meets Pedrillo and they decide to rescue Konstanze . Osmin leaves and Belmonte enters and happily reunites with Pedrillo . Together they resolve to rescue Konstanze and Pedrillo 's fiancÃ e , Blonde , who is Konstanze 's servant ( Aria : `` Konstanze , Konstanze , dich wiederzusehen â O wie Ã ngstlich '' â `` `` Konstanze , Konstanze , to see thee again â Oh what trembling '' ) .