<human>: So we have been together for 1.5 years and since college we are in a LDR.  Everything was all and well until my girlfriend [18F] "joined" this club at her school.  Technically she didn't really join as she didn't pay the fee, but she still goes every week as she made friends with these 3 guys that are members of the club.  Soon, she was over at their dorm (these 3 guys are roommates) every Friday until the morning and still continuing going to these meetings although she said she wasn't really interested in the club itself...
The breaking point of my trust was when one day she was over at their dorm, she stayed until 6am, went back to her dorm to sleep, and woke up at 8am to get breakfast with one of the roomies.  However, one of my friends who she frequently talks to (whom I am close to as well), said that she told her that she actually slept over (something she said she'd never do, knowing how uncomfortable I'd feel her sleeping over at a triple guys' dorm).  In addition, when she came over at 8am, she left herself in as he was taking a showering at the time and just happened to come back topless when he knew she was in there.  They proceeded to take pictures in where she used these pictures to show to her friends about how handsome he is, while blocking these pictures from me and never ever even mentioning this.  I validated this story with her and said her reason for this was "just for fun".  What do i do?

Give me the gist of the text in a nutshell
<bot>: gf joins club, meets a few guys, constantly over at their dorm, takes a buncha pictures with one guy, shows him off to her friends "for fun" all the while keeping it quiet to me.