It's wrong to tell someone else's secrets without their permission.
Jack's friend has had a crush on the same coworker for several years but has a girlfriend.
Jack wants to help his friend figure out who he belongs with.
Jack sets up an appointment with a therapist so his friend has a space to work through his attraction.
Jack tells the coworker about his friend's attraction to her.
Jack's friend is grateful to talk over his girl troubles.
Jack's friend is furious as his girlfriend has now dumped him.