There's a very thin line between being nice and allowing oneself to be a complete doormat -- a line many kind-hearted people struggle to identify.  Here are a few indicators that you probably should tone down the niceness factor just a little bit: 1. No matter how many t imes people let you down, you continue to issue them free passes.  All it takes is an ostensibly heart-felt apology for you to take someone back. Perhaps you're still with your boyfriend even after he cheated on you three times. Maybe you've kept in your life an old friend who has been spotted talking behind your back on a number of occasions. It's important to recognize that saying sorry means nothing if the person repeats the very behavior they express contrition for.  2. You constantly put others' needs and wishes before your own.  One thing is to help out those who find themselves in a real bind. Another is to bend over backwards for them at the expense of your own happiness, even when their...