My girlfriend's sister is always really mean to me 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. Should I break up with her?
When my girlfriend's sister is mean to me and I defend myself, my GF defends her. When her sister is mean to me and I ignore her, my girlfriend gets angry with me for ignoring her sister. What should I do?