Othello and Iago are similar???

While reading Act IV of  Othello, the Moor of Venice William Shakespeare, I realized that the situation that Othellos has found himself in is very similar to that of Iago.  At this point in the play, Othello is miserable.  He is at the point of hating his wife Desdemona who he believes cheated on him.  On the other hand, Iago was in a similar situation at the beginning of the play.  There was a rumor that his wife Emilia had slept with Othello, and Iago began to treat his wife even worse.  Emilia says "Oh, fie upon them!  Some such squire he was / That turned your wit the seamy side without, / And made you to suspect me with the Moor (IV. ii. 145-47)."  Emilia and Desdemona are in similar situations as well, accused of infidelity that they did not commit.  The only difference was that Desdemona was set up by Iago.  I think this speaks to Iago's motivation.  He had to go through the pain of being told his wife slept with Othello, so he wanted Othello to feel the same pain.  So far, he's done a good job.