It's bad to lie about your feelings to your partner.
Peter is jealous that his wife Pam is spending time with a new guy friend, when Pam asks him if she can go away with the guy for the weekend.
Peter wants to respond to his wife's request.
Peter tells Pam that he isn't comfortable with his wife going away alone with another guy.
Peter doesn't want to admit his insecurity, so he tells his wife that he's fine with her going on the trip with the new friend.
Pam cancels her plans with her new guy friend and instead goes for a weekend getaway with Peter.
Pam spends the weekend with the new friend and begins to develop romantic feelings for him.