<human>: Can you provide a brief rundown of the text in within 3 sentences?

I have been with my girlfriend now for almost 2 years. We met whilst at university and lived in our student halls together. When we moved out of there, we continued living together, but just as the two of us.
It all started out great. I graduated and got a job, and she is still in her final year of university right now. But sadly things have been deteriorating over the past 3-4 months. My girlfriend has been feeling the pressure of the final year of university, this means she is often stressed and prone to snapping. Very short tempered. Sometimes I feel I can't even talk to her without fear of provoking an argument.

I feel like I try my best to lower the stress for her. I cook almost every night for her and I assist her with her uni work if she is stuck or could use some advice, but I feel that whatever I do is just not enough to keep her happy. We have such on and off days that it makes me feel worthless or rather that nothing I can do is good enough for her. I have told her how I feel on multiple occasions, but it usually results in her becoming quite volatile and passing the blame on to me, it's almost impossible to communicate with her because she ALWAYS has to be right .

She tends to be really good at twisting an argument from something she knows has done wrong, but refuses to admit it, in to something about me.
Is this a case of us moving in together too quickly considering we lived together the entire time we have known eachother? 

Maybe it was too rushed and I never saw this side of her.

Many thanks Reddit :)
<bot>: relationship has slowly deteriorated, gf turns hostile when I want to talk about it. Feel guilty for wanting to break up whilst she is already stressed but worried how she will react.