just what I tut too....you couldnt have said it any better. The truth is that the part of my heart that wanted to advise you just shut down cos you said you betrayed your own friend....honey there are so many ways you can help her stop cheating rather than doing what you did..
PS..this is a healthy criticism!
She is your friend,because you have eyes for her man you told the guy that she is cheating on him.she tut you were a good friend that's the reason she confided in you that she has a boyfriend and for the record,is he married to her despite the fact that she has a baby for him? then you should up your face and told the boy the secret only you and your friend is suppose to know.What a friend you are?
You dont need any advice from anyone, if you have a conscience you know the right thing to do.