<human>: Give me a shortened version of the text

The background: Her [22f] and I [24m] dated for two and half years at a very small college (~1300 students), she's a senior graduating soon, whereas I'm an alumni in the area taking a year off before graduate school. For those two and half years things went fairly well although she could be very temperamental and abrasive at times which caused some issues with our broader social groups and our relationship.  We were dating until a week ago when she brutally broke up with me out of the blue, laughed at me when I said how hurt I was with how she managed the breakup and told me to stay away from her and her house where a lot of our mutual friends live. 

Since this happened I have been pushing myself to be very social to get my mind off things, and have been visiting different friend groups on campus and hanging out at my old fraternity a lot. However, I'm starting to get really pissed because nearly everyone keeps telling me of their awful encounters with her, and the really terrible things she has done to them and their friends (things like making rape comments, insulting groups of disadvantaged people to their faces, not apologizing to or acknowledging others who are hurt by her behavior, generally being rude and disrespectful, etc.) I never knew the details of these events, and when I heard rumours she always denied them or changed the story to validate her behavior. I've come to the conclusion that she moderates her behavior only around the people she likes or wants to impress, and doesn't give shit around everyone else. It's like I was in a bubble where I didn't hear about this stuff because of the relationship and only heard these things after it popped. 

This is making me really angry and I'm not sure how to talk about it with our mutual friends who are more or less still in the "bubble" I want to be honest with them and myself, but that more or less involves me telling them I (and a lot of other people) think she is a terrible person.  What should I do?
<bot>: Girlfriend dumps me brutally and coldly, everyone constantly tells me stories of what an awful person she is; I'm pissed and not sure how to handle it with mutual friends.