It is wrong to interfere in someone else's friendship.
Jane is chatting with her brother Bob, who's complaining about problems he's been having with his best friend Tim.
Jane wants to offer Bob some solutions.
Jane tells Bob about what she did when she was facing a similar problem, while also pointing out the differences in their respective situations.
Jane tells Bob that he should immediately sever the friendship, and she states her very negative opinion of Tim.
Bob applies parts of Jane's resolution to her problem to his own situation and manages to salvage his relationship with Tim.
Bob considers Jane's solution and breaks off his friendship with Tim.