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

Some of you may remember me from my last post, [where my GF fucked up so called "night of my junior life".] And the thing is... i stayed.

And it's getting worse. And i don't what to do. And i don't know what I shall do. Or what's the best for me.

It's about her. But mostly it's about me, and my unspecified feelings. So, we still have arguments from time to time and what scares me the most is her ability to just forget whatever happened. She can yell that she hates me, that i fucked up her day (she recently had birthday) but when her crying won't work on me she puts all the blame on me and unfortunately... i apologize. The worst thing i could possibly do. Or, even better, she changes her words around and makes this argument pointless and silly. And she forgets about it. Next day. 

So, i spent her birthday by her side, and i'm not sure what I feel and what i'm supposed to feel. When she hugged me, kissed me, I had this weird feeling that... I had to be there. I don't want to. But i don't want to hurt her at the same time. Come on, few hours back we had serious argument in which she stated she's going to cry all night and she hates me (also that i will end this relationship in months time, i guess she kinda expects it). 

I'm not sure I want to break up. It's killing me inside. But there's another issue. In two months time I have my big exam (my country equivalent of USA SAT). And I'm not sure what will happen if I break up with her. I read a lot about problems after breaking up with BPD partners and I'm scared I won't be able to focus on studying and basically screw up my life.
<bot>: not sure what to do with my bpd partner, as my SAT is coming closer and closer, scared i will fail.