<human>: Hi /r/relationships,

My girlfriend and I have been living together for 1.5 years on campus in the same share apartment. I'll keep this short and simple: recently an argument broke out, and couples argue all the time which is normal. During the course of this argument I was extremely sick (I fainted that day, had a very high fever (39+ degrees celcius), bad diarrhea and couldn't eat anything the entire day).

During the argument she hit snapped and hit me really hard on my hand. I could tell that she was looking to hit me somewhere as she accosted me quickly. I'm thinking of leaving her due to this. Is it actually true that violence actually gets progressively worse? I don't want to give her the wrong idea by staying with her that I will tolerate hitting me or physical violence is O.K. She got it from her upbringing (her mother and her sisters are very nasty). I can tell that it's something that will always stay in her.

She didn't feel bad about it for the first 3 days and actually tried to justify it (which was awful). She only recently tried to apologize.

Can you give me the gist of the text in a nutshell?
<bot>: Can't decide whether to leave current girlfriend in light of her hitting me really hard on the hand during an argument. Does it get worse or is it a one off?