How should I react to my girlfriend who cries after every argument?

Every single time we fight or argue she ends up crying (Me 22, her 19). Her voice gets all shaky and it's annoying because it is every single time. How do I react to this? I feel like I end up just caving in and saying it's okay to her. But by now I'm over it and don't know how to react because I feel like genuinely telling her to shut up sometimes. Please give advice so I don't end up yelling at her for crying.
How should I react to my girlfriend who cries after every argument?
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