^(Throw away account to keep other account private. We are both 19 and have been together for a year and a half.)

At the start of college my girl started complaining about how shitty her friends were and how she never wants to see them again. Long story short, after a full 8 months of hearing her trash talk them, she gets a text from her "friends" asking her to go out yesterday. I was pretty uncomfortable with this because her friends are all slutty but I kept my cool. She goes out with them and gets drunk. Today I saw her and asked how it was and she tells me this whole story about how she was trying to tell these guys to buy her friend a drink, how some guy approached her telling her shes the hottest out of her friend group and how he wanted a hook up, and how some guy slapped her ass. I was fucking pissed but still kept it together and changed the topic and then dropped her off.

How would you respond to this shit? I am so mad and confused.