It is wrong to ruin someones chances at employment.
Jacks boyfriend wants to apply for a job at Jacks workplace and wants to use him as a reference.
Jack wants to keep his personal life separate from his work.
Jack has a conversation with his boyfriend expressing his discomfort with them possibly working together.
Jack gives his boyfriend a bad reference to ensure he doesn't get the job.
Jack is able to make a decision with his boyfriend that suits both their needs.
Jack is devastated when he gets dumped after his boyfriend finds out what he did.