In chapter 2 Paul basically says that he was not trying to screw them over with lies and treachery. He builds the case that his motives were pure and that he lived before God not men. It definitely seems like he's admonishing the people who live in Thessalonica for doubting him.
But in chapter 3 he says that the churches faith and perseverance had helped to strengthen him and give him hope. That their conduct had given him encouragement. If this is what he is saying, and it is, what is the point of chapter 2?
I don't understand.