It started when my gfs friend moves in to our house cause she dint have a place to stay since covid and shes broke.

as soon as she moves in, she goes out to meet some guy and she comes back and some random person rolls up and asks where (lets call her amber) is ? I say shes in the guest room and he hangs out with her for awhile

and this has been going on for a couple weeks now and she kinda is leading two guys and goes on dates for food with random people in the city.

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she dosent look like a slut but she sure as hell acts like it , my gf always tell me to be nice and not say much about her. but Its pretty funny cause amber has been tested with genital herpes i just dont know if she should stay at the house anymore cause it might be a health hazard for me and my gf.

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another thing is since shes my gfs close friend I kinda dont want to be an asshole and tell her skank ass to bugger off in a not so nice way

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guys what should I do