Episode 3 Part 4

The last part of episode 3 was on last night, so here's how it went down.. So in the final part of episode 3, Cassio finds this random handkerchief (but we know it's from Iago) and gives it to the town whore, Bianca. So now Bianca has the handkerchief. Like later in the episode, Othello starts freaking out on Desdemonda because she thinks she lost the handkerchief and it was so special. Obviously Iago's words are taking a toll on Othello's mind. But anyway, this show is getting really good, but how could all these people not understand that they're being fooled by one guy??