What bad things happen in Act 2 of Othello?

• Iago puts thoughts into Roderigo's head about how Cassio seems to love Desdemona and how she appears to love him back.

• Iago instructs Roderigo to find a way to anger Cassio, so that Iago can begin to discredit him in the eyes of Montano and others in Cyprus. Roderigo agrees.

• Iago sets Cassio up and Othello, offended, dismisses him from his position.

• Iago continues to manipulate Cassio.