I want to support and comfort my girlfriend, but she complains constantly and I can’t handle it?

Anonymous
Since we started dating a year ago, she nearly always has something going wrong. Health stuff, family/friend drama, anxiety, body image, work, etc. At the beginning she would apologize every time she would complain saying that people say she complains too much. I reassured her that it was fine not realizing just how constant it would become. She just has an incredibly pessimistic outlook on everything, to the point where I can count on one hand the amount of positive texts she has sent me in the last 3 months.

She has been severely sick with kidney stones for the last 3 months, and basically our entire relationship has turned into her saying she is in pain and me saying “I’m sorry”. We barely talk about anything else, she doesn’t have energy for anything, and the few times we have hung out she is basically moaning the whole time.

I obviously want to comfort her and support her, but this is killing me. I don’t know how to tell her to stop complaining so often about literally everything. I feel horrible because I know she doesn’t want this, but there just isn’t a relationship anymore. How do I tell her to stop complaining as much when she constantly has something going on? I don’t know how to respond to these texts and interactions with anything but support? I feel like I can’t tell her to stop complaining because that is just cruel when she is just looking for comfort.
I want to support and comfort my girlfriend, but she complains constantly and I can’t handle it?
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