First of all, the relationship between Othello and Desdemona is weak because it is merely based on pity and not true love. Othello tells the Duke of Venice about how his love for Desdemona began after he was accused of eloping and marrying her without her consent.
"Twas pitful,twas wonderous pitful;/She wished she had not heard it, yet she wished/That heaven had made her such a man.She thanked/me,/… She loved me for the dangers I had passed,/ And I loved her, that she did pity them."(1.3.160-167)
In this passage, the Duke of Venice asked Othello why he loves Desdemona, he tells him that his love has grown as Desdemona would listen to his stories about war and pity them. By Othello saying this it provides evidence that there is no fundamental foundation binding this relationship together. Othello is basing his love on pity instead of the strong affection and feelings that is necessary to hold or keep a relationship together. This clearly lays out that the relationship between the two is not really based on much. Albert Gerard discusses how Othello 's lack in self- knowledge contributes to his poor judgments.
"But even Othello's love affair with Desdemona, judging by his own report, seems to have developed smoothly, without