Can I please get some relationship advice?

So, it's been happening for a while now. We both are arguing very often. I feel like she is expecting the same things she does for me, but whatever I do feels small and she is expecting more from me. But I am trying my best to keep her happy. But I honestly don't think I can give more. There are times she is happy and there are times she is really upset over the same things. I feel unhappy. I don't know what to do next. Should I break up? Or should I give it some time?
I'm too scared to ask for a breakup , because she says she doesn't know what she'll do if something happens to us. I also don't want to hurt her because I really care for her. What do I do?
Can I please get some relationship advice?
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