tush,never tell me !i take it much unkindly .that thou ,iago ,who hast had my purse.as if strings were thine ,shouldst know of this .
Roderigo is angry because of something Iago tells him. Roderigo has been giving money to his friend, and his friend has just been passed over for a military promotion. During this scene we learn little alse about Roderigo's anger. Possibly he's been lending to his friend on the premise that Iago is getting the promotion, and therefore will be able to pay him back quickly.......
Othello
