<human>: Can you give me the gist of the text in a nutshell?

So there is this one girl. We'll just call her SLUT for all purposes here. Now, at the beginning of my freshman year the University, SLUT had a boyfriend from back home. Later on in the semester, SLUT and my roommate, let's call him Herp, decided to start boning. Of course I tell my roommate, "Dude, you know she has a boyfriend." But then he said that SLUT said, "I love sex too much." Anyways, SLUT proceeds to start to bone another one of my friends, lets name him Derpie. Later on, SLUT's boyfriend finds out that she's been cheating on him, they break up. SLUT doesn't care and proceeds to keep on fucking Herp and Derpie on and off. Later on, she starts dating Derpie (no clue why), but yet she still cheats on him occasionally with Herp. Also, SLUT starts to fuck other guys, mostly guys in Derpie's dormitory. First time I told Derpie that she cheated on him with another dude from my dorm (not my roommate, I haven't said anything about that) and he was like, "Thanks for telling me bro." But then the next day, she is pissed as fuck at me and guys from my dorm are like, "Do not be a relationship wrecker!" But then Derpie's dumbass still says with SLUT afterwards and she still continues to cheat on him. What the hell do I do? Derpie and I rarely talk anymore because my roommate and I pretty much called her out on being a SLUT.
<bot>: Close friend's girlfriend is a slut and has been cheating on him with my roommate and multiple dudes. Don't know what to do about it.