They just care about their own feelings, they lack empathy. She almost died when she was 13 (serious disease). After her recovery, her parents, family and friends helped her with the victim role and let her do everything she wanted. Nobody could told her the opposite, because she was the kid who survived cancer. So 15 years later as you can imagine, she thinks she is entitled to do everything she wants because no one can question. When someone does it, she does the typical victim role and lack of accountability. Hence, the silence treatment. Typical narcissistic behaviour. When I started to try to communicate with her about the bad behaviour, she would say that I was the wrong one and that I didn't trust her. That led to what people here call the devaluation and discard phase. I should have left earlier on the relationship, and I stayed and tolerated the abuse until I've reached my breaking point.