Based on your story it sounds like your girlfriend didn't volunteer this information? It's a shame that you were informed of that in an inappropriate context.
That said, your girlfriend is under no obligation to tell you about her sexual history unless it will directly affect you (in the case of an STD). Just as you have the right to maintain your own private history with your sexuality. Stories about sexual history are not need to know information, and their divulgence is usually dependent on their partners comfort level. Maybe she felt you would judge her or think differently of her and that's why she didn't say anything? She's entitled to that.
It's a terrible shame that someone said such a personal thing to you. Consider your own feelings in the case of an ex partner of yours calling your lady up and giving her all the gory details about your sexual encounters. Would you like that? Would you feel ashamed or fearful of judgment?
Personally I don't feel that knowing my partners history, short of health concerns, could provide any insight or positive information that would be beneficial to my relationship.
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