One heartbreaking agent, Bernd Dressler, made his job sound like that of a hit man explaining in a recent interview:
"I knock on the door. I introduce myself and I say that my client no longer wishes to continue the affair. It's very simple. It takes two minutes and it happens on the doorstep."
For $40 the agent will end things over the phone, but you can pay $65 to upgrade if you want the agent to deliver the news in person. I think the phone sounds like the more humane option.