    Sentence 1: My girlfriend's sister is always  really mean tome in front of my GF. My GF  defends her when'I' stand up to her. My GF.  ‘says that she is her sister and she will-defend  her sister and I should just learn:to tolerate  her Sister. Shoul I break up with her?    Sentence 2: When my girlfriend's sister is  mean tome and I defend al my GF  defends her. When her sister@ mean to me.  and-I ignore her, my girlfriend gets angry  math me for ignoring her sister: What should  1    2