I have a dilemma

I am talking to this guy hes amazing like melt my heart perfect but there a problem. he want me to meet his friends which is fine i guess but one of his bestfriends (the persian who introduced us) was a guy i was habib a jokey fling with nothing physicsl happened but pictures were sent idk what to do i feel so guilty i know the guy doesnt have the photos because he has a girlfriend and she goes on his Phone whenever ( we became friends which adds more guilt) I just o don't know if I should keep my mouth shut or tell the guy I'm talking to what happened