So let me get this straight, you want to kill your dying husband so that your dying lover can have his heart?

I think you might have some serious self-esteem issues. Why do you think it is that you don't see yourself with a healthy man? Why is it that both men in your live are facing vital organ failure?

I'd say learn to love yourself, ditch the pair or them and find yourself someone without major health problems. Get out of that intensive care unit and investigate more functional places to meet more functional men, like the internet.