My girlfriend was abused by her ex?

Last night, my girlfriend decided to tell me about her last relationship and her ex boyfriend. She was subjected to a lot of abuse which included verbal insults, hair pulling and occasional punches in the ribs. This went on for the final few months of their relationship and it took a while for her to open up in ours (which is understandable). There's a lot of pressure on me to treat her well and i have no intention of doing otherwise, she's an amazing woman. But I need some advice on how to treat a partner who has been a victim of abuse. Is there anyone who can help me?
My girlfriend was abused by her ex?
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