Pacing was not in the top 1700 Deadly Sins, so I think we both want to absolve Jonathan of all guilt or blame. In fact, I think it's a good thing you're getting in your steps. So he's not really asking you a question, he's kind of diagnosing the cause of the problem. He says, I have to assume it's an involuntary mechanism for reducing the anxiety. "I don't know that pacing and walking are any different than each other"
Also: why do people pace while talking on the phone?