Othello was completely in love with his wife, the lovely Desdemona.
The use of mistaken identity in this play did not refer to someone seeming to be who they weren't, it was the jealousy that took hold after Othello thought of what could have been, what should've, in his mind, been.
When everyone found out about their marriage, Othello was proud.
When he figured out that Cassio had Desdemona's handkerchief, though, he doubted her faithfulness.
He ended up murdering his wife, before he knew the whole story.
This is kind of like how, in this video, this man describes the different impulses for reasoning. He is like a teenager, and goes with his gut feeling instead of passing the information to the logical portion of his brain.
After he killed the "greatest good he was ever gonna get," Emilia, Iago's wife, told him the truth about her husband.
When Othello found out the truth, he committed suicide.
At least he didn't drown himself. For, Iago said to Roderigo, "Drown thyself? Drown cats and blind puppies!".
So, to summarize this, Othello was one for the big picture, ever when his perception of the whole picture would've changed had he been logical enough to avoid the wool being pulled over his eyes.
If you want, you may watch this video, it explains how we could have avoided Othello's guilt had Desdemona had a sassy gay friend.
Wait…. That is not a duck.
