It's bad to want to kill one's partner.
Bernie is in a rocky relationship with Valerie and has grown sick of her.
Bernie wants to get Valerie out of his life.
Bernie tells Valerie that he no longer wants to date her.
Bernie comes up with a secret plan to kill Valerie.
Valerie cuts off all contact with Bernie and never seems him again.
Valerie learns about Bernie's plan and calls the police to arrest him.