An explanation about the soliloquies in Othello, the shakespearean play.

Good Morning Mr nic and fellow class mates, I have chosen a dramatised reading to perform today. In the moments before this soliloquy Iago has just finished telling Roderigo, that he should go out and make some money so he can buy gifts for the lovely Desdemona.
Thus do I ever make my fool my purse:
For I mine own gain'd knowledge should profane,
If I would time expend with such a snipe.
But for my sport and profit. I hate the Moor:
And it is thought abroad, that 'twixt my sheets
He has done my office: I know not if't be true;
But I, for mere suspicion in that kind,
Will do as if for sure…