It's wrong to betray your friends.
Lena and her friend are applying for the same job.
Lena wants to get the job.
Lena works hard on her resume and on polishing her interview skills.
Lena sabotages her friend's application by secretly changing her resume.
Lena gets the job on her own merits and her friend is happy for her.
Lena's friend gets angry at her and ends their friendship when she finds out.