IME the sad reality of the world is that the more capable you are of going cold blooded at will, the happier and more satisfying your life will be (e.g. having no qualms about eliminating people from your life if they're making you unhappy). In other words, sometimes being nice and being happy are mutually exclusive and you've gotta choose one or the other. And happiness is always the better option. Best idea in my opinion. I stuck around with my ex after our messy as all hell break up (after me catching her cheating) and it did not end well. Far from it. I learned that once you're over, you're over. Stop watering dead flowers.