Tldr: I had sex with my friends girlfriend in someone else tent which resulted in the loss of my virginity, a black eye, most likely a lot of pissed of people and the realization that maybe i am not the nice person i thought i was.
Infidelity is a very tricky subject. In most cases, I think that the blame lies mainly with the person doing the cheating. The exception is if the cheat-accomplice is friends with the cheatee.
Nah that was my other friend. I don't really know the guy who's girlfriend it was. Well i do, but he's not a close friend more a nice guy thats a friend's friend. I doubt he laughed to be honest.
See, you didn't really know the guy. I suppose you might feel bad, since you think he's nice, but it's not really your fault. You had an opportunity with a willing participant. She was willing even though she had a boyfriend, therefore that is her issue.
Now, if you
were friends with the dude, then there would be some betrayal on your part. But this isn't the case. Maybe others might disagree, but I don't really think it is your job to regulate another person's morals. If they want to cheat, they will do it, and that is their choice.
Oh I am not drunk enough. Soon I will be. 11 days till non-stop drunkenness! Oh wait actually I have exams stupid being born during typical spring exam times.