I slept with my friends husband?

Personally I doubt I would be in this situation...but I wouldn't tell her as things could get nasty and you could get all the blame...I know you are guilty and you acted like the worst friend ever, but it was also his fault. if the husband is a jerk sooner or later he will cheat again with another woman and she will find out. Just stay away from them, it is the only thing you can do!