<human>: Both twenty two, I am the male, relationship is one and a half years. 

Basically, we've been going through a rough patch recently. Both of us are equally under a lot of stress; I have a new job, she's in finals at school, and on top of that, a close friend of hers was diagnosed with cancer. It has been hard on both of us and we haven't been the happiest, but we're trying.

Recently, though, my gf seems to think she isn't good enough for me. She keeps saying things like "I don't deserve you" whenever she's had a particularly stressful day, and, after being recently estranged from her mother, my gf is terrified to "become her" (to be fair, her mother is batshit insane and has a history of treating people she cares about terribly). My gf is worried that she is starting to treat me that way, though I don't see it, and doesn't want to hurt me, so she brought up the option of breaking up. Reddit, what do I do, and how do I show I still love her to death?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: gf is amazing, I love her, she's scared she's going to hurt me emotionally due to stress. How can I make her see sense? I don't want to live without her.