Dee
All you can do is stay out of the cheating business altogether. If your best friend's girlfriend suspects you ratted her out, she'll hate on you and blame you for everything because "someone" must be held accountable for her indiscretions, right? The "blame game " is older than time itself but it's used as a way to easily forgive oneself. Try not to over think it too much. Good luck and when you speak with your friend again, leave her out of the conversation.