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Sounds like a set up. I would have them both arrested for conspiracy to commit assault designed to cause severe bodily harm or even death depending on where the gun was aimed.
Lie detector results are not admissible in court. But if the DA/police are unsure who to believe if the other 2 are lying about your gun....the DA/Police may take the positive results on your lie detector test and decide to charge your gf and the guy. Plus, it really sounds like a set up...gf asking you to apologize about something...the other guy being there, etc.