"Can I count on you if I wait to see what happens?"
"You can trust me. Go now and get cash. I told you before, and I’ll tell you again and again: I hate the Moor. I’m devoted to my cause of hating him, just as devoted as you are to yours. So let’s join forces and get revenge. If you seduce Desdemona and make a fool out of him, it’ll be fun for both of us"
"If you you don`t like working for the moor then just quit."
"No, calm down. I’m serving under him to take advantage of him. We can’t all be masters, and not all masters should be followed."
Iago and Rodrigo are both jealous. Iago is jealous of Cassio because Iago wanted to be Lieutenant but Othello made Cassio Lieutenant. Rodrigo is jealous of Othello because he is married to Desdemona.