Bullshit

I don't understand why my partner is treating me like shit in front of her mum? She's completely ignoring me and when I so her a question like how was your day I get a rude reply or when she wants me to start a conversation she doesn't even care what I want to talk about or gives me short comments or replies? I don't get it. We have been together for 1 year and 7 months as of yesterday and we have been living to get her for about a year now. Is it me? Am I doing something wrong?