Girlfriend has doubts because she says we're both financially unstable?

We're both broke and she gets all in her head about our future every now and then and cries and says maybe we should break up, but we haven't yet, I have never wanted to, but with her being like this every couple months I just don't know if I can take it anymore. I love her dearly, want to marry her, she's not into the whole marriage thing and just wants to stay together forever or whatever. Just don't know what to do anymore
Girlfriend has doubts because she says we're both financially unstable?
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