<human>: Around January time, my girlfriend's dad and I had a small argument about our GCSEs. My girlfriend is Polish and finds school fairly hard, so I was speaking with her dad about helping her, revising with her etc. 

However, he was fairly negative, saying the reason she was struggling with school was because she was lazy, stupid etc. This scaled into a bit of an argument, and I walked out.

Since then, I haven't been able to see her even outside of her house, and her mum told me that he doesn't trust or like me.

And more, her dad stops her from going to school during study leave (holiday during exams) to revise, because he thinks its so she can see me. Her dad regularly calls her a slut, whore etc behind her back.

I have no idea what to do about this, we often have arguments and we are not as happy together as we used to be (together for 1 year).

I know that this isn't just a problem with her needing to prepare for exams, because her parents always let her go to and sleepover at friends.

I have considered breaking up with her, but I don't know if this is right? (I know it's wrong to ask people online if you should break up with someone, but I don't know what to do.)

Can you condense the text into a few key points?
<bot>: Girlfriend's (almost) verbally abusive dad hates me, won't let me see her after argument, although he lets her see other friends.