There is no secret that is always keep hidden...Tell the truth and face the consequences.

OK I slept with my best friend.
She's dating somebody who lives far away and only sees her BF a few times a year. We've been hanging out for about 8 months and have become great friends mainly being relationship advisors to each other, and i don't think we ever really considered sleeping with each other. Our friends had recently been making comments that we should be dating. But we dismissed any such comments, valuing our friendship more.
But it still happened, drunk but still consciously and mutually.
We spent the entire next day together talking about it, coming to the conclusion that our friendship is more important and we should focus on that and that she loves her BF.
On the other hand he is so far away, has no clue when he might actually move here, and we get along great. Spend time talking every day, and have loads of fun together.
Friendship seems to be ok right now, and I’d rather keep that than jeopardize that with a relationship. But maybe our friends are right and we would be better off dating, and we just deny this to ourselves…..

Any experience in that department appreciated

You need to be in shock, and you need to stop calling her your best friend. Best friends don't do that. You don't even have the nerve to tell her to stop using him. Be careful what you do in life because it will come back full circle. One day you might be in the same boat if your not already.

thank you kilo. I know that sounds mean but COME ON you slept with her bf and you have "feelings" for him
either A) QUIT talking to her BF AT ALL period NO CONTACT or
B) STOP calling her your friend at all, if you cared about her or her feelings you wouldnt be doing this..
Good Luck to you nymph and I hope you make the right decision