We are in relationship for 3 years and I can't stand her behavior anymore. Whenever I don't do something she wants, for example if she wants us to go out today, and I want to go out the other day, she gets angry and makes a sacrifice of herself (says I don't care about our relationship and how only she fights for us). Such behavior is repeated throughout the relationship. She is able to get angry for 3 days and not talk to me. Of course, after each discussion she threatens to break up. She is very stubborn and I don't know what to do anymore.