I have never claimed to be perfect in this relationship, I've left him, cheated on him throughout…

I have never claimed to be perfect in this relationship, I've left him, cheated on him throughout our relationship, but he also did that and then some. I always looked past the bullshit, we both tried I guess. My fucking sister just texted me about how I'm doing... I tell her about how things are going and her response was that I need to accept the fact that we were both at fault. Her response to me saying I know everyone thinks I'm dumb for getting pregnant was.. it is what it is..... I'm blown away at the loving sister I have. My response to her was I'm not taking the blame this time, I didn't do anything for him to treat me this way, anyway I'm doing good thanks for checking up on me, love you. I wish I could tell her to go fuck herself, but she's our moms kiss ass so she would call her to make me look bad.