I read somewhere that if someone does something to hurt you and you don't tell them, if they keep doing it, it's partly your fault too. How often have we inadvertently done something that inconvenienced or upset someone else without ever having any intention of doing so. A lot of the time these situations can be misunderstandings or poor communication. I also think your idea of people being "bad", isn't a great attitude to have. Look there are people who do bad things and aren't sorry, but most people don't actually want to cause harm! The closer you get to someone the more you have conflict, and conflict isn't necessarily a bad thing. Its how you handle conflict that enables you to have closeness with someone and overcoming it, that builds trust. If you don't trust people, you can never form close bonds. That being said, only you can judge who you allow in your circle and your gut plays a big role in that.