In the novel, Lancelot by Walker Percy, Lancelot, the main character becomes obessessively consumed by the fact that his wife has cheated on him in the past. This drives him to the point of insanity. For the most part, he never comes out and directly confronts her, but quietly stews and broods about the possibilities. This eventually leads to his madness and his subsequent commitment to the mental ward. What one can learn from this is the danger of assuming something without having definitive proof, and that at the very least confronting someone who's wronged you can bring closure of sorts.
