Girlfriend hates her birthday?

So it's my girlfriend's birthday today and at first I wanted to go see her and spend time with her. But she has to take a test on her birthday and needs to study. So I was wishing her a happy birthday and trying to spoil her over text messages (like a bunch of compliments, trying to make today all about her). But she told me that today isn't special and she wanted to only focus on me. I got a little mad at that and told her no, I was going to treat her special. Well we got into a little argument over it and she told me that everyone forgets her birthday and I should too. She said something always goes wrong and to not spoil her or anything different. I guess she ended up crying cause of the argument and now she thinks I'm gonna break up with her. I don't know what to do, I just wanted to treat her special for her birthday is all.
Girlfriend hates her birthday?
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