It's not very nice to snap at a friend.
Walter's friend tells him that he has been secretly talking with Walter's girlfriend.
Walter wants his friend to stop talking to his girlfriend in secret.
Walter tells his friend that it is very hurtful to hear that he has been talking to Walter's girlfriend in secret, and he asks his friend to stop doing that.
"Walter points at his friend and yells loudly, ""you better stop talking to her behind my back!""."
Walter and his friend have a conversation about what has been going on and come to a resolution that they can both live with.
Walter and his friend are both upset and the conversation ends without any resolution.