My girlfriend overthinks a lot, any ideas on how I can help her?

Anonymous
When she's home alone during the week when she has a day off and I'm at college, my girlfriend tends to find herself overthinking about our previous arguments and problems and makes things worse for herself, which causes us to argue more. Any suggestions of things I could do or say to help this? Please? It kills me to see her in this way..
My girlfriend overthinks a lot, any ideas on how I can help her?
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