My opinion of cheating on people:
WELLLLL
Cheating OFF people: kind of rude. I understand it's a bit uncontrollable, however, I'm normally being cheated off of...Personally, I don't mind it, but what benefit is anyone going to have when it comes to tests besides the fact that it's going to boost your minor grades?
Cheatin ON people: really rude. Dude, if you love her, you wouldn't cheat in the first place. If you loved the person you were cheating with, you would dump your girl. If you're in the middle, and you've been in the middle, you need to go away and think about who you want first. Yes, I'm talking to you, Hye Mi/Bella Swan/Jan Di/Ji Hoo/Chang Ryul! If you keep both, they're both going to get hurt, and they both are going to begin getting tired of you.