What to do if I slept with my best friend's boyfriend?

I slept with my bffs boyfriend what should I do

First of all it takes two too do it.
If I was you id feel dissapointed.
But the question is whether to tell your friend or not?
It really is up to you this is a big risk.
So discuss it with the boy first.
Good luck with everything x

Big NoNo!!!
Sorry, hun, but you may have just destroyed the relationship with your bff.
If you want to stay bff, NEVER again get near the creep, but don't p*ss him off or he will tell, and DON'T you tell. In fact, go into your list of questions and turn this anonymous.

But I think that you and your bff are probably done for. Sorry. After all if she had done this to you ... ? Then what would you honestly feel?
The question you have to ask yourself is, Why would you do that?
Good Luck!!

You have to tell her! Before someone else does
in time she may forgive you for the fact that you had the guts to tell her yourself but if she hears it from someone elses they could add bits in like youve been sleeping with him all along
im sorry to say this but I think you no what youve done is wrong and telling her is the punishment for what you have done!!

OOPS? Ok, well you have nothing better to do but to tell her, because if you dont then she will find out from someone else which will make things worse.. unfortuantely.. This is what you have caused, you should tell her boyfriend you are going to be telling your bestfriend.. and to brace whatever is coming. :]

Uhh yeah, you've messed up pretty bad but you have to tell her. I wouldn't expect this to pan out very well. Accept whatever answer/punishment she sets out for you because whatever it is, it is what you deserve for betraying her.