I didn't get my girlfriend anything for her birthday when I went to visit her
Why didn't you get her a birthday gift?
I'm broke
That sucks!  I hope she understands why you couldn't get her a gift.  Being broke is the worst!
I secretly hope she gets me a gift for my birthday.
It is not good to expect gifts when you don't give gifts and you should really do something about being broke. You need to try to earn enough so that you can make a living and have extra in case of things like emergency and gifts.