You can say you work or you go to school but don’t say the exact place. Keep in mind; a few people are great at drawing an obvious conclusion to learn more about you than you intended them to know. Always go slow and take as much time as necessary to becoming more acquainted with somebody.
If so, you need to—with as much kindness and compassion as possible—set some very firm boundaries with her.
Is she asking you not to see your friend, or otherwise trying to restrict your relationship with her?
You should be careful about any individual who insists on your information.
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If your friend implicitly or explicitly is unsupportive or undermining, then you need to either set boundaries with your friend about this behaviour, or at least show your girlfriend you hear and understand her concerns, are aware of the behaviour, and will not let your friend damage the relationship. Are you honest with her, and consistent with your words and actions?
Do you show up for her and make an honest effort to meet her needs? Do you criticize her for having relationship needs? It could be that your girlfriend’s jealousy is a proxy for some other underlying issue in the relationship—get curious and try to find out what it is.
You will be faithful to her, but she cannot stop you from seeing your friends.
(On that note: are you both clear on what “faithful” means to both of you? )Is it not causing problems for the relationship, but just causing your girlfriend pain?
Is your friend supportive of your relationship with your girlfriend, or are they trying to undermine it?