She needs to talk to the manager and if the guy is not fired on the spot she should take it higher. There is a certain level of professionalism that is required when working at a business that has private information about somebody. As soon as that line has been crossed then it needs to be dealt with immediately.
If the guy had any kind of interest in her he should have talked to her directly. Not be a loser and try to use her 'private' information to contact her.
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