I just don't know what to do! Please Help! Long Question?

WOW! Based on what I've read... she seemed to feel that you do things (may not be intentional on your part or maybe it is) that she finds offensive. When she tells you about it, you become defensive and making her feel that she's delusional. You said you don't care about her and yet, you continue to argue with her... why? Perhaps you yourself want to be liked. The idea that someone is telling you that you are not being nice, at first you find funny which turns to insult and I think that is why you are acting like that towards her. You want to be like more than her and you want to be the center of attention and I think that is what causing your problem with her. She sees it and she confronts you about it.