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I wonder if your “friend” called a rav or the shmiras halashon hotline to check if she was even allowed to tell you this.
On second thought, maybe your job isn’t really to check him out.
I think now that you heard this information, you should ask what to do with it (if anything). I have a feeling asking a rav will be more to get you to stop questioning the shidduch than to stop the shidduch itself.