Based on a genuine quotation from the essay 'Old Mortality', "Books were the proper remedy: books of vivid human import, forcing upon their minds the issues, pleasures, busyness, importance and immediacy of that life in which they stand; books of smiling or heroic temper, to excite or to console; books of a large design, shadowing the complexity of that game of consequences to which we all sit down, the hanger-back not least.'
Yes - no point being unkind and feeling bad energy. I do believe it's true that you reap what you sow. Treat good people poorly and anyone with self respect will leave. Better to walk away and let that person continue to experience their poor decisions without you bearing witness or taking part.