I would like to say rape....but lets be honest with ourselves. He cheated. He couldve prevented it if he really didnt want to but he let her.
True, he even had a chance to get help from the nurse. I feel like the blonde will end up forgiving him though cuz she's in love with him and super nice which to me would be a mistake cuz this situation could easily be taken towards a really emotional and heartbreaking route. But now it feels like this author is just taking the typical smut route where the guy gets everything he's ever wanted without doing anything or really suffering
He still told her no and she forced herself on him IT WAS RAPE. Did you ever think maybe he didn’t say anything to the nurse because as a guy maybe he was embarrassed of being raped by a girl? Plus, the girl even said, that she’d scream if he didn’t let her rape him which means that she threatened to act like she was the one being raped. Women are always going to be taken more seriously when it comes to rape accusations because the way society views the rape of men is that it is nothing and the guy should just “get over it” and this view simply continues on with the idea that men shouldn’t have feelings.
lets think for amoment...to cheat, you need someone (in this case girlfriend) for you to cheat...now, his relationship with her (blonde girl) is just a temp contract and not real couple (even though she really love him but never tell him)...so basically he is still single...and can someone single cheating?? cheat whom?? his right hand or left hand??...so basically cheating was never an option...
Id say its rape. He rejected the girl many times, saying that she was very drunk and all.
I would also like to disagree with "he even had a chance to get help from the nurse". You agreed that he cheated on his girlfriend because he was not able to stop the girl from raping him, is that correct? So it was not rape because he "willingly cheated" on his girlfriend. Therefore, the sex he had with the brown haired girl was consensual. So are you saying that rape victims that were not able to get help or defend themselves from rapists were actually not raped but a consensual sex?

So either he just got raped or he willingly cheated on his girlfriend.