Ungenerous

"I have every reason in the world to think ill of you. No motive can excuse the unjust and ungenerous part you acted there. You dare not, you cannot deny that you have been the principal, if not the only means of dividing them from each other, of exposing one to the censure of the world for caprice and instability, and the other to its derision for disappointed hopes, and involving them both in misery of the acutest kind."