I'm sorry, I was talking behind your back.
Really? Why were you talking about me behind my back?
I was asked some gossip about you. I'm trying to do the right thing here.
I appreciate you telling me about this. I'm a little hurt, but I'm grateful that you were honest with me.
You're so nice, next time I talk behind your back I will do it when you're here to defend yourself.
Thank you for the complement, but we really shouldn't talk about others or spread gossip. It's offensive and it can be hurtful if the information is untrue and gets spread by others.