Antonio's unexplained depression – "In sooth I know not why I am so sad" – and utter devotion to Bassanio has led some critics to theorise that he is suffering from unrequited love for Bassanio and is depressed because Bassanio is coming to an age where he will marry a woman. In his plays and poetry Shakespeare often depicted strong male bonds of varying homosociality, which has led some critics to infer that Bassanio returns Antonio's affections despite his obligation to marry: