I have a girlfriend who got drunk while playing outside last time and fucked one of my classmates. My classmates put me in charge. What should I do now?

Look at that time, you were drunk. Did you give her to xx or did she and you xx? This is very important. If your classmate is drunk and unconscious, you should take the opportunity to fuck her. If your classmate turns out to be a virgin, you must be responsible. If it wasn't her first time, and she didn't completely lose consciousness that night, you can be irresponsible. Because it's a one-night stand at best.

Are you on good terms with your girlfriend? If you are good, ask her forgiveness. If you keep it from her, you will feel guilty all your life, and once she knows it, she will be even more sad in the future.

I seem to understand. There's a problem. If it is your girlfriend and your classmate xx, you are not responsible. If it were me, I would give your classmate a K class and then dump my girlfriend. This kind of woman is not worth it.