I'll bet you cheated on him too and that's why you decided to pull an asshole of a prank like that. If you were my girlfriend I would have broken up with you for that shit.

I wouldnt want you as my girlfriend.

Maybe if he wasn't cheating and was baffled, OP would have looked closer at the panties and said something like "oh, my panties must have gotten there in the wash..." or whatever...however I don't think the prank would have come from nowhere without a suspicion...either way, FYL and you are better off knowing the truth and moving on!

he was right to cheat on you.

I would be more pissed at him for cheating, not at myself for finding out that way. Regardless of how you did it, he still cheated. Your better off

you realize that now every insecure girl that reads this is going to try it

How is that prank even funny? it's immature and makes you seem insecure. seriously if it went well he would most likely be like "uhh haha?" it sucks you found out that way for sure, but YDI for pulling dumb pranks to possibly trick your boyfriend

She didn't deserve the cheating. She deserved the situation of it all.

In no way to i condone doing that as a prank, however, fyl that he has been a cheating scumbag

You totally didn't deserve that! It's a good way to find out though:)