You were going to kill yourself... Why should you? Kill him instead. He double-crossed you. He deserves it.
9 seconds sound clip from the The Doctor Prescribed Death (Suspense) classic radio play.
You can hear this line at 00:09:54 in the radio play.
Quote context
[...]
- But I'd better forget him.- But it isn't, so easy as that, is it?
- No. I figured I'd done something and blaming myself.
- Do you... do you know this blonde woman in this snapshot?
- No.
- It must be a woman he has met recently. You've known him for four years.
- I don't think you are to blame. He is the one in wrong then and he should be made to suffer!
- How?
- Now, let me go a little deeper into the situation.
- Whenever a person has reached the conclusion...
- You are sure you have made up your mind?
[...]