<human>: Can you condense the text into three sentences or less?

For the last 3 or 4 days, she's just been calling me a liar, and I have no idea why. I haven't lied to her about anything at all, I'm always completely honest with her. I have no idea why is she doing this.. She's been treating me really badly and telling me she doesn't want me, that she wants to leave me.. When I ask her what she thinks I'm lying about, she simply will not tell me. Words will not reach out to her.. She doesn't believe anything.. :( I don't know where to go from here.. 

She says she just doesn't trust me at all, and it hurts a lot. She's also the only person I ever talk to, I don't have any other friends. She told me she's not tired of me, but that she's tired of thinking bad things about me.. She says she's always thinking that I would just leave her for some other girl whenever I met somebody else and when I tell her that's not true, she calls me a liar.. I can't say anything that changes her mind.. I just don't know what to do.. I'm no liar, I've always been completely honest with her.. She's so convinced that I would leave her for somebody else that she wants to leave me because she thinks that.. :( But I don't talk to anyone else but her, and I don't want anyone else.. She also told me that she doesn't believe anything that I EVER say, and that she doesn't trust me, and that she doesn't know why she feels that way.. I've always been so honest with her and a very good boyfriend to her, I don't know what I've done to deserve this :(

I'm sorry this is such a mess and not very orderly.. I'm in a terrible state right now.. :(
<bot>: Girlfriend thinks I'm a liar and cannot believe anything I ever say, and she thinks bad things about me that aren't true.. And wants to break up with me for it..